Heterocyclic compounds as kinase inhibitors

ABSTRACT

Heterocyclic compounds as CDK4 or CDK6 or other CDK inhibitors are provided. The compounds may find use as therapeutic agents for the treatment of diseases and may find particular use in oncology.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of U.S. patent applicationSer. No. 16/277,355, filed Feb. 15, 2019, which claims priority to U.S.Provisional Application No. 62/631,437, filed Feb. 15, 2018, thecontents of both which are incorporated herein by reference in theirentireties.

FIELD OF THE INVENTION

This disclosure relates generally to therapeutics which play a crucialrole in the control of the cell cycle and more particularly, compoundsthat inhibit cyclin-dependent kinases (CDK). The invention also providespharmaceutically acceptable compositions comprising compounds of thepresent invention and methods of using said compositions in thetreatment of diseases associated with these pathways.

BACKGROUND OF THE INVENTION

The cell cycle is a period between the successive divisions of a cell.During this period, the contents of the cell must be accuratelyreplicated. The processes that permit the cell to divide are veryprecisely controlled by a multitude of enzymatic reactions amongst whichthe protein kinase-triggered protein phosphorylation plays a major role.In eukaryotes, there are four main stages/phases of cell cycle namelythe Gap-1 (G1) phase, Synthesis (S) phase, Gap-2 (G2) and Mitosis (M)phases. An extended phase of Gap-1 phase is coined as Gap-0 (G0) phaseor Resting phase (Cancers 2014, 6, 2224-2242).

Uncontrolled proliferation is the hallmark of cancer and otherproliferative disorders and abnormal cell cycle regulation is,therefore, common in these diseases. Cyclin-dependent kinases (CDK)constitute a heterodimeric family of serine/threonine protein kinasesinvolved in cell cycle and transcription. They include two main groups:cell cycle CDK and transcriptional CDK. The functionality of CDK dependson specific interactions with regulatory proteins named cyclins whichform heterodimeric complexes with their partners. These complexes areimportant regulators of the cellular processes, especially in the cellcycle progression.

The human proteome contains 20 CDK along with 29 cyclins. CDK1, CDK2,CDK4 and CDK6 are generally considered cell cycle CDK, whereas CDK7,CDK8, CDK9 and CDK11 are mainly involved in transcription regulation(Genome Biol 2014;15(6):122, Nat Cell Biol 2009;11(11):1275-6). CDKS isthe prototype of atypical CDK: it is activated by the non-cyclinproteins p35 (or Cdk5R1) and p39 (or Cdk5R2) and has unique post-mitoticfunctions in neuronal biology, angiogenesis and cell differentiation.Proliferative signals induce the transition from the G0 or G1 phasesinto S phase through the activation of the structurally related CDK4 andCDK6 [Development, 2013;140 (15):3079-93, Biochem Pharmacol2012;84(8):985-93, Nature 2014;510(7505):393-6]. The binding of cyclin Dto CDK4 and to CDK6 promotes the phosphorylation of the transcriptionalrepressor retinoblastoma protein (RB1).

CDK hyperactivity is often observed in cancer, reflecting theirprominent role in cell cycle and transcription regulation. In cancercells, the process of cell division becomes unregulated, resulting inuncontrolled growth that leads to the development of a tumor. A numberof mechanisms contribute to the dysregulation of the cell cycle inmalignant cells, including the amplification and hyperactivity ofCDK4/6, or their genomic instability, which might cause CDK4/6 to becomeoncogenic drivers of cell replication. Usurping these mechanisms, cancercells can continue to replicate by triggering the G1 to S phasetransition. This process appears to be facilitated by a shortening ofthe G1 phase. In a cancer cell, CDK4/6 antagonizes intrinsic tumorsuppression mechanisms including cell senescence and apoptosis, whichfurther augments the growth of a tumor. Cancer cells also upregulateother CDK and cyclins and decrease suppressive mechanisms such asintrinsic CDK inhibitors and tumor suppressor proteins. The overalleffect of this type of cell cycle dysregulation is malignant cellproliferation and the development of cancer (Clinical Breast Cancer,2016, 1526-8209).

Several CDK inhibitors have been reported (such as in W02011101409 andWO2011101417) or clinically developed. Flavopiridol and R-Roscovitine(Seliciclib), were the first generation of pan-CDK inhibitors withanti-tumor activity attributed to down-regulation of CDK9-mediatedanti-apoptotic proteins, especially Mc1-1. Recently, a new generation ofCDK inhibitors have been developed, advanced to clinical trials, andapproved for certain types of cancer. Dinaciclib, a selective inhibitorof CDK1, CDK2, CDK5, and CDK9, was directed towards refractory chroniclymphocytic leukemia while palbociclib was tested against advancedestrogen receptor (ER)-positive breast cancer as a selective inhibitorof CDK4 and CDK6. The development of more selective second and thirdgeneration CDK inhibitors, including specific CDK4/6 inhibitors, has ledto a renewed enthusiasm for manipulating the cyclin D1-CDK4/6 axis incancer treatment. There are three FDA-approved CDK4/6 inhibitorspresently: Palbociclib, Ribociclib and Abemaciclib.

The development of therapies, including monotherapies, for treatment ofproliferative disorders using a therapeutic targeted generically at CDK,or specifically at dual inhibition of CDK4 and CDK6, is thereforepotentially highly desirable.

There is still a need for new CDK4/6 inhibitors. Compounds for thetreatment of hyper-proliferative diseases preferably have at least oneadvantageous property selected from selectivity, potency, stability,pharmacodynamic properties and safety profile. In this regard, a novelclass of CDK4/6 inhibitors is provided herein.

BRIEF SUMMARY OF THE INVENTION

In one embodiment, provided is a compound of Formula (J):

or a salt thereof, wherein X, Y, Z, R¹, R², R³, R⁴, 1, m and n are asdetailed herein.

In some embodiments, provided is a compound of Formula (I):

or a salt thereof, wherein X, Y, A, B, L, R¹, R², R³, R⁴, R⁵, R⁶, 1, m,n, p and q are as detailed herein.

In some embodiments, provided is a compound of Formula (II):

or a salt thereof, wherein X, Y, C, D, R¹, R², R³, R⁴, R⁵, R⁶, 1, m, n,p and q are as detailed herein.

In some embodiments, the compound of Formula (I) or a salt thereof is ofFormula (I-A) as detailed herein,

In another aspect, provided is a method of treating cancer in anindividual in need thereof comprising administering to the individual atherapeutically effective amount of a compound as detailed herein, suchas a compound of any one of Formula (J), Formula (I), Formula (II),(I-A), (I-B1) to (I-B12), (I-C1) to (I-C23), or a pharmaceuticallyacceptable salt thereof. Also provided is a method of modulating CDK4/6in an individual, comprising administering to the individual a compounddetailed herein, or a salt thereof. Also provided is a method ofmodulating CDK4/6 and one or more of CDK1, CDK2, and CDK9 in anindividual, comprising administering to the individual a compounddetailed herein, or a salt thereof. Also provided is a method ofinhibiting CDK4/6 in a cell, comprising administering a compounddetailed herein, or a salt thereof, to the cell. Also provided is amethod of inhibiting CDK4/6 and one or more of CDK1, CDK2, and CDK9 in acell, comprising administering a compound detailed herein, or a saltthereof, to the cell. In some embodiments of the methods detailedherein, the methods comprise administration of a compound detailedherein, or a salt thereof, as a monotherapy.

In another aspect, provided is a pharmaceutical composition comprising acompound detailed herein, or a pharmaceutically acceptable salt thereof,and a pharmaceutically acceptable carrier or excipient. Kits comprisinga compound detailed herein, or a salt thereof, are also provided. Kitsmay optionally include instructions for use, such as instructions foruse in any of the methods detailed herein, for example, for use in thetreatment of cancer. A compound as detailed herein, or a salt thereof,is also provided for the manufacture of a medicament for the treatmentof cancer.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows the body weight changes of the mice in the different groupsof a pharmacological study of test compound in a MC-38 mouse model.

FIG. 2 shows the relative change of body weights (%) of the mice in thedifferent groups of a pharmacological study of test compound in a MC-38mouse model.

FIG. 3A and FIG. 3B show tumor growth curves of the mice in thedifferent groups of a pharmacological study of test compound in a MC-38mouse model.

FIGS. 4A-4D show individual tumor growth curves of the mice in thedifferent groups of a pharmacological study of test compound in a MC-38mouse model.

FIG. 5 shows tumor growth inhibition curves of the mice in the differentgroups of a pharmacological study of test compound in a MC-38 mousemodel.

FIG. 6 shows time-to-end point Kaplan-Meier survival curves of the micein the different groups of a pharmacological study of test compound in aMC-38 mouse model.

DETAILED DESCRIPTION OF THE INVENTION Definitions

“Alkyl” refers to and includes saturated linear and branched univalenthydrocarbon structures and combination thereof, having the number ofcarbon atoms designated (i.e, C₁-C₁₀ means one to ten carbons).Particular alkyl groups are those having 1 to 20 carbon atoms (a “C₁-C₂₀alkyl”). More particular alkyl groups are those having 1 to 8 carbonatoms (a “C₁-C₈ alkyl”), 3 to 8 carbon atoms (a “C₃-C₈ alkyl”), 1 to 6carbon atoms (a “C₁-C₆ alkyl”), 1 to 5 carbon atoms (a “C₁-C₅ alkyl”),or 1 to 4 carbon atoms (a “C₁-C₄ alkyl”). Examples of alkyl include, butare not limited to, groups such as methyl, ethyl, n-propyl, isopropyl,n-butyl, t-butyl, isobutyl, sec-butyl, homologs and isomers of, forexample, n-pentyl, n-hexyl, n-heptyl, n-octyl, and the like.

“Alkenyl” as used herein refers to an unsaturated linear or branchedunivalent hydrocarbon chain or combination thereof, having at least onesite of olefinic unsaturation (i.e, having at least one moiety of theformula C═C) and having the number of carbon atoms designated (i.e,C₂-C₁₀ means two to ten carbon atoms). The alkenyl group may be in “cis”or “trans” configurations, or alternatively in “E” or “Z”configurations. Particular alkenyl groups are those having 2 to 20carbon atoms (a “C₂-C₂₀ alkenyl”), having 2 to 8 carbon atoms (a “C₂-C₈alkenyl”), having 2 to 6 carbon atoms (a “C₂-C₆ alkenyl”), or having 2to 4 carbon atoms (a “C₂-C₄ alkenyl”). Examples of alkenyl include, butare not limited to, groups such as ethenyl (or vinyl), prop-1-enyl,prop-2-enyl (or allyl), 2-methylprop-1-enyl, but-1-enyl, but-2-enyl,but-3-enyl, buta-1,3-dienyl, 2-methylbuta-1,3-dienyl, homologs andisomers thereof, and the like.

“Alkylene” as used herein refers to the same residues as alkyl, buthaving bivalency. Particular alkylene groups are those having 1 to 6carbon atoms (a “C₁-C₆ alkylene”), 1 to 5 carbon atoms (a “C₁-C₅alkylene”), 1 to 4 carbon atoms (a “C₁-C₄ alkylene”) or 1 to 3 carbonatoms (a “C₁-C₃ alkylene”). Examples of alkylene include, but are notlimited to, groups such as methylene (—CH₂—), ethylene (—CH₂CH₂—),propylene (—CH₂CH₂CH₂—), butylene (—CH₂CH₂CH₂CH₂—), and the like.

“Alkynyl” as used herein refers to an unsaturated linear or branchedunivalent hydrocarbon chain or combination thereof, having at least onesite of acetylenic unsaturation (i.e, having at least one moiety of theformula C≡C) and having the number of carbon atoms designated (i.e,C₂-C₁₀ means two to ten carbon atoms). Particular alkynyl groups arethose having 2 to 20 carbon atoms (a “C₂-C₂₀ alkynyl”), having 2 to 8carbon atoms (a “C₂-C₈ alkynyl”), having 2 to 6 carbon atoms (a “C₂-C₆alkynyl”), or having 2 to 4 carbon atoms (a “C₂-C₄ alkynyl”). Examplesof alkynyl include, but are not limited to, groups such as ethynyl (oracetylenyl), prop-1-ynyl, prop-2-ynyl (or propargyl), but-1-ynyl,but-2-ynyl, but-3-ynyl, homologs and isomers thereof, and the like.

“Aryl” refers to and includes polyunsaturated aromatic hydrocarbongroups. Aryl may contain additional fused rings (e.g, from 1 to 3rings), including additionally fused aryl, heteroaryl, cycloalkyl,and/or heterocyclyl rings. In one variation, the aryl group containsfrom 6 to 14 annular carbon atoms. Examples of aryl groups include, butare not limited to, phenyl, naphthyl, biphenyl, and the like.

“Carbonyl” refers to the group C═O.

“Cycloalkyl” refers to and includes cyclic univalent hydrocarbonstructures, which may be fully saturated, mono- or polyunsaturated, butwhich are non-aromatic, having the number of carbon atoms designated(e.g, C₁-C₁₀ means one to ten carbons). Cycloalkyl can consist of onering, such as cyclohexyl, or multiple rings, such as adamantly, butexcludes aryl groups. A cycloalkyl comprising more than one ring may befused, spiro or bridged, or combinations thereof. A preferred cycloalkylis a cyclic hydrocarbon having from 3 to 13 annular carbon atoms. A morepreferred cycloalkyl is a cyclic hydrocarbon having from 3 to 8 annularcarbon atoms (a “C₃-C₈ cycloalkyl”). Examples of cycloalkyl include, butare not limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl,1-cyclohexenyl, 3-cyclohexenyl, cycloheptyl, norbornyl, and the like.

“Halo” or “halogen” refers to elements of the Group 17 series havingatomic number 9 to 85. Preferred halo groups include fluoro, chloro,bromo and iodo. Where a residue is substituted with more than onehalogen, it may be referred to by using a prefix corresponding to thenumber of halogen moieties attached, e.g, dihaloaryl, dihaloalkyl,trihaloaryl etc. refer to aryl and alkyl substituted with two (“di”) orthree (“tri”) halo groups, which may be but are not necessarily the samehalo; thus 4-chloro-3-fluorophenyl is within the scope of dihaloaryl. Analkyl group in which each hydrogen is replaced with a halo group isreferred to as a “perhaloalkyl.” A preferred perhaloalkyl group istrifluoroalkyl (—CF₃). Similarly, “perhaloalkoxy” refers to an alkoxygroup in which a halogen takes the place of each H in the hydrocarbonmaking up the alkyl moiety of the alkoxy group. An example of aperhaloalkoxy group is trifluoromethoxy (—OCF₃).

“Heteroaryl” refers to and includes unsaturated aromatic cyclic groupshaving from 1 to 10 annular carbon atoms and at least one annularheteroatom, including but not limited to heteroatoms such as nitrogen,oxygen and sulfur, wherein the nitrogen and sulfur atoms are optionallyoxidized, and the nitrogen atom(s) are optionally quaternized. Aheteroaryl group can be attached to the remainder of the molecule at anannular carbon or at an annular heteroatom. Heteroaryl may containadditional fused rings (e.g, from 1 to 3 rings), including additionallyfused aryl, heteroaryl, cycloalkyl, and/or heterocyclyl rings. Examplesof heteroaryl groups include, but are not limited to, pyridyl,pyrimidyl, thiophenyl, furanyl, thiazolyl, pyrazolyl, oxazolyl,isooxazolyl, imidazolyl, quinolyl, isoquinolyl, benzimidazolyl,benzpyrazolyl, benzotriazolyl, indole, benzothiazyl, benzoxazolyl,benzisoxazolyl, imidazopyridinyl and the like.

“Heterocycle” or “heterocyclyl” refers to a saturated or an unsaturatednon-aromatic group having from 1 to 10 annular carbon atoms and from 1to 4 annular heteroatoms, such as nitrogen, sulfur or oxygen, and thelike, wherein the nitrogen and sulfur atoms are optionally oxidized, andthe nitrogen atom(s) are optionally quaternized. A heterocyclyl groupmay have a single ring or multiple condensed rings, but excludesheteroaryl groups. A heterocycle comprising more than one ring may befused, spiro or bridged, or any combination thereof. In fused ringsystems, one or more of the fused rings can be aryl or heteroaryl.Examples of heterocyclyl groups include, but are not limited to,tetrahydropyranyl, dihydropyranyl, piperidinyl, piperazinyl,pyrrolidinyl, thiazolinyl, thiazolidinyl, tetrahydrofuranyl,dihydrooxazolyl, dihydroisoxazolyl, dioxolanyl, morpholinyl, dioxanyl,tetrahydrothiophenyl, and the like.

“Oxo” refers to the moiety ═O.

“Optionally substituted” unless otherwise specified means that a groupmay be unsubstituted or substituted by one or more (e.g, 1,2,3,4 or 5)of the substituents listed for that group in which the substituents maybe the same of different, provided that the group's normal valence isnot exceeded. In one embodiment, an optionally substituted group has onesubstituent. In another embodiment, an optionally substituted group hastwo substituents. In another embodiment, an optionally substituted grouphas three substituents. In another embodiment, an optionally substitutedgroup has four substituents. In some embodiments, an optionallysubstituted group has 1 to 2, 2 to 5, 3 to 5, 2 to 3, 2 to 4, 3 to 4, 1to 3, 1 to 4 or 1 to 5 substituents.

As used herein “CDK” refers to one or more cyclin-dependent kinases.CDK4/6 refers to both CDK4 and CDK6. Thus, inhibitors of CDK4/6 inhibitboth CDK4 and CDK6.

A “pharmaceutically acceptable carrier” refers to an ingredient in apharmaceutical formulation, other than an active ingredient, which isnontoxic to a subject. A pharmaceutically acceptable carrier includes,but is not limited to, a buffer, excipient, stabilizer, or preservative.

As used herein, “treatment” or “treating” is an approach for obtainingbeneficial or desired results including clinical results. For example,beneficial or desired results include, but are not limited to, one ormore of the following: decreasing symptoms resulting from the disease,increasing the quality of life of those suffering from the disease,decreasing the dose of other medications required to treat the disease,delaying the progression of the disease, and/or prolonging survival ofindividuals. In reference to cancers or other unwanted cellproliferation, beneficial or desired results include shrinking a tumor(reducing tumor size); decreasing the growth rate of the tumor (such asto suppress tumor growth); reducing the number of cancer cells;inhibiting, retarding or slowing to some extent and preferably stoppingcancer cell infiltration into peripheral organs; inhibiting (slowing tosome extent and preferably stopping) tumor metastasis; inhibiting tumorgrowth; preventing or delaying occurrence and/or recurrence of tumor;and/or relieving to some extent one or more of the symptoms associatedwith the cancer. In some embodiments, beneficial or desired resultsinclude preventing or delaying occurrence and/or recurrence, such as ofunwanted cell proliferation.

As used herein, “delaying development of a disease” means to defer,hinder, slow, retard, stabilize, and/or postpone development of thedisease (such as cancer). This delay can be of varying lengths of time,depending on the history of the disease and/or individual being treated.As is evident to one skilled in the art, a sufficient or significantdelay can, in effect, encompass prevention, in that the individual doesnot develop the disease. For example, a late stage cancer, such asdevelopment of metastasis, may be delayed.

As used herein, an “effective dosage” or “effective amount” of compoundor salt thereof or pharmaceutical composition is an amount sufficient toeffect beneficial or desired results. For prophylactic use, beneficialor desired results include results such as eliminating or reducing therisk, lessening the severity of, or delaying the onset of the disease,including biochemical, histological and/or behavioral symptoms of thedisease, its complications and intermediate pathological phenotypespresenting during development of the disease. For therapeutic use,beneficial or desired results include ameliorating, palliating,lessening, delaying or decreasing one or more symptoms resulting fromthe disease, increasing the quality of life of those suffering from thedisease, decreasing the dose of other medications required to treat thedisease, enhancing effect of another medication such as via targeting,delaying the progression of the disease, and/or prolonging survival. Inreference to cancers or other unwanted cell proliferation, an effectiveamount comprises an amount sufficient to cause a tumor to shrink and/orto decrease the growth rate of the tumor (such as to suppress tumorgrowth) or to prevent or delay other unwanted cell proliferation. Insome embodiments, an effective amount is an amount sufficient to delaydevelopment. In some embodiments, an effective amount is an amountsufficient to prevent or delay occurrence and/or recurrence. Aneffective amount can be administered in one or more administrations, inthe case of cancer, the effective amount of the drug or composition may:(i) reduce the number of cancer cells; (ii) reduce tumor size; (iii)inhibit, retard, slow to some extent and preferably stop cancer cellinfiltration into peripheral organs; (iv) inhibit (i.e, slow to someextent and preferably stop) tumor metastasis; (v) inhibit tumor growth;(vi) prevent or delay occurrence and/or recurrence of tumor; and/or(vii) relieve to some extent one or more of the symptoms associated withthe cancer. An effective dosage can be administered in one or moreadministrations. For purposes of this disclosure, an effective dosage ofcompound or a salt thereof, or pharmaceutical composition is an amountsufficient to accomplish prophylactic or therapeutic treatment eitherdirectly or indirectly. It is intended and understood that an effectivedosage of a compound or salt thereof, or pharmaceutical composition mayor may not be achieved in conjunction with another drug, compound, orpharmaceutical composition. Thus, an “effective dosage” may beconsidered in the context of administering one or more therapeuticagents, and a single agent may be considered to be given in an effectiveamount if, in conjunction with one or more other agents, a desirableresult may be or is achieved.

As used herein, the term “individual” is a mammal, including humans. Anindividual includes, but is not limited to, human, bovine, horse,feline, canine, rodent, or primate. In some embodiments, the individualis human. The individual (such as a human) may have advanced disease orlesser extent of disease, such as low tumor burden. In some embodiments,the individual is at an early stage of a proliferative disease (such ascancer). In some embodiments, the individual is at an advanced stage ofa proliferative disease (such as an advanced cancer).

Reference to “about” a value or parameter herein includes (anddescribes) embodiments that are directed to that value or parameter perse. For example, description referring to “about X” includes descriptionof “X”.

It is understood that embodiments, aspects and variations describedherein also include “consisting” and/or “consisting essentially of”embodiments, aspects and variations.

Compounds

In one aspect, provided is a compound of the Formula (J):

or a salt thereof, wherein: Z is

wherein

A is C₃-C₆ cycloalkyl, 4- to 7-membered heterocyclyl, 5- to 7-memberedheteroaryl, or C₆ aryl, each of which is optionally substituted with R⁵;

L is a bond, —CR¹¹R¹²—, —O—, —S—, —SO₂—, —C(O)—, —NR¹⁰—, —SO₂NR¹⁰—, or—NR¹⁰SO₂—;

B is hydrogen, C₃-C₆ cycloalkyl, 3- to 7-membered heterocyclyl, 5- to7-membered heteroaryl, or C₆ aryl, each of which is optionallysubstituted with R⁶;

C is C₃-C₆ cycloalkyl, 5- to 7-membered heterocyclyl, 5- to 7-memberedheteroaryl, or C₆ aryl, each of which is optionally substituted with R⁵,wherein C is fused to D; and

D is C₃-C₆ cycloalkyl, 3- to 7-membered heterocyclyl, 5- to 7-memberedheteroaryl, or C₆ aryl, each of which is optionally substituted with R⁶;

each X and Y are independently N or CH, provided that at least one of Xand Y is N;

R¹ is hydrogen, C₁-C₆ alkyl, C₂-C₆ alkenyl, C₂-C₆ alkynyl, C₁-C₈ alkoxy,C₃-C₆ cycloalkyl, 3- to 12-membered heterocyclyl, 5- to 10-memberedheteroaryl, C₆-C₁₄ aryl, —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), —(C₁-C₃alkylene)(3- to 12-membered heterocyclyl), —C(O)R¹⁰, —(C₁-C₃alkylene)(5- to 10-membered heteroaryl) or —(C₁-C₃ alkylene)(C₆-C₁₄aryl), wherein R¹ is independently optionally substituted by halogen,oxo, —OR¹³, —NR¹³R¹⁴, —C(O)R¹³, —CN, C₃-C₈ cycloalkyl, or C₁-C₆ alkyloptionally substituted by oxo, —OH or halogen, provided that when Z is

n is 1 and R² is oxo, then R¹ is C₂-C₆ alkyl, C₂-C₆ alkenyl, C₂-C₆alkynyl, C₁-C₈ alkoxy, C₃-C₆ cycloalkyl, 3- to 12-membered heterocyclyl,5- to 10-membered heteroaryl, C₆-C₁₄ aryl, —(C₁-C₃ alkylene)(C₃-C₆cycloalkyl), —C(O)R¹⁰, or —(C₁-C₃ alkylene)(C₆-C₁₄ aryl), wherein R₁ isindependently optionally substituted by halogen, oxo, —OR¹³, —C(O)R¹³,—CN, C₃-C₈ cycloalkyl, or C₁-C₆ alkyl optionally substituted by oxo, —OHor halogen;

each R² is independently C₁-C₆ alkyl, oxo, —NR¹¹R¹², —CN, —C(O)R¹⁰,—C(O)NR¹¹R¹² or halogen, wherein any two R² groups are independentlyattached to same carbon or two different carbons;

each of R³ and R⁴ is independently C₁-C₆ alkyl, C₃-C₆ cycloalkyl, C₁-C₆haloalkyl, C₁-C₆ alkoxy, C₁-C₆haloalkoxy, halogen or —OH;

each R⁵ is independently C₁-C₆ alkyl, C₂-C₆ alkenyl, C₂-C₆ alkynyl,halogen, oxo, —CN, —OR¹⁰, —SR¹⁰, —NR¹¹R¹², —C(O)R¹⁰, —C(O)NR¹¹R¹²,—OC(O)NR¹¹R¹², —NR¹⁰C(O)R¹¹, —NR¹⁰C(O)NR¹¹R¹², —S(O)R¹⁰, —S(O)₂R¹⁰,—NR¹⁰S(O)₂R¹¹, —S(O)₂NR¹¹R¹², C₃-C₆ cycloalkyl, 3-to 12-memberedheterocyclyl, —(C₁-C₃ alkylene)OR¹⁰,——(C₁-C₃ alkylene)SR¹⁰, —(C₁-C₃alkylene)NR¹¹R¹², —(C₁-C₃ alkylene)C(O)R¹⁰, —(C₁-C₃alkylene)C(O)NR¹¹R¹², —(C₁-C₃ alkylene)NR¹⁰C(O)R¹¹, —(C₁-C₃alkylene)NR¹⁰C(O)NR¹¹R¹², —(C₁-C₃ alkylene)S(O)₂R¹⁰, —(C₁-C₃alkylene)NR¹⁰S(O)₂R¹¹, —(C₁-C₃ alkylene)NR¹⁰S(O)₂NR¹¹R¹², —(C₁-C₃alkylene)S(O)₂NR¹¹-R¹², —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), —(C₁-C₃alkylene)(3- to 12-membered heterocyclyl), wherein each R⁵ isindependently optionally substituted by halogen, oxo, —OR¹³, —NR¹³R¹⁴,—C(O)R¹³, —CN, —(C₁-C₃ alkylene)OR¹³, —(C₁-C₃ alkylene)NR¹³R¹⁴, —(C₁-C₃alkylene)C(O)R¹³, C₃-C₈ cycloalkyl, or C₁-C₆ alkyl optionallysubstituted by oxo, —OH or halogen;

each R⁶ is independently oxo or R⁷, or any two R⁶ groups, when bound tothe same carbon atom, are taken together with the carbon to which theyare attached to form a C₃-C₆ cycloalkyl;

R⁷ is independently hydrogen, C₁-C₆ alkyl, C₂-C₆ alkenyl, C₂-C₆ alkynyl,C₃-C₆ cycloalkyl, 3- to 6-membered heterocyclyl, —OR¹⁰, —NR¹¹R¹²,—NR¹⁰C(O)R¹¹, —NR¹⁰C(O)NR¹¹R¹², —S(O)₂R¹⁰, —NR¹⁰S(O)₂R¹¹, —S(O)₂NR¹¹R¹²,—C(O)R¹⁰, —C(O)NR¹¹R¹², —(C₁-C₃ alkylene)CN, —(C₁-C₃ alkylene)OR¹⁰,—(C₁-C₃ alkylene)SR¹⁰, —(C₁-C₃ alkylene)NR¹¹R¹², —(C₁-C₃ alkylene)CF₃,—(C₁-C₃ alkylene)C(O)R¹⁰, —(C₁-C₃ alkylene)C(O)NR¹¹R¹², —(C₁-C₃alkylene)NR¹⁰C(O)R¹¹, —(C₁-C₃ alkylene)NR¹⁰C(O)NR¹¹R¹², —(C₁-C₃alkylene)S(O)₂R¹⁰, —(C₁-C₃ alkylene)NR¹⁰S(O)₂R¹¹, —(C₁-C₃alkylene)S(O)₂NR¹¹R¹², —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), or —(C₁-C₃alkylene)(3- to 6-membered heterocyclyl), wherein each R⁷ isindependently optionally substituted by halogen, oxo, —OR¹³, —NR¹³R¹⁴,—C(O)R¹³, —CN, —(C₁-C₃ alkylene)OR¹³, -—C₁-C₃ alkylene)NR¹³R¹⁴, —(C₁-C₃alkylene)C(O)R¹³, C₃-C₈ cycloalkyl, or C₁-C₆ alkyl optionallysubstituted by oxo, —OH or halogen;

R¹⁰ is independently hydrogen, C₁-C₆ alkyl, C₃-C₆ cycloalkyl, —(C₁-C₃alkylene)(C₃-C₆ cycloalkyl), C₆-C₁₄ aryl, 5- to 6-membered heteroaryl or3- to 6-membered heterocyclyl, each of which is independently optionallysubstituted by halogen, oxo, —CN, OR¹⁵, —NR¹⁵R¹⁶, or C₁-C₆ alkyloptionally substituted by halogen, —OH or oxo;

R¹¹ and R¹² are each independently hydrogen, C₁-C₆ alkyl, C₃-C₆cycloalkyl, —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), C₆-C₁₄ aryl, 5- to6-membered heteroaryl or 3- to 6-membered heterocyclyl, each of which isindependently optionally substituted by halogen, oxo, —CN, —R¹⁵,—NR¹⁵R¹⁶ or C₁-C₆ alkyl optionally substituted by halogen, —OH or oxo;

or R¹¹ and R¹² are taken together with the atom to which they attachedto form a 3- to 6-membered heterocyclyl optionally substituted byhalogen, oxo, or C₁-C₆ alkyl optionally substituted by halogen;

R¹³ and R¹⁴ are each independently hydrogen or C₁-C₆ alkyl, wherein theC₁-C₆ alkyl of R¹³ and R¹⁴ are optionally substituted by halogen, —OR¹⁵,—NR¹⁵R¹⁶, or oxo;

or R¹³ and R¹⁴ are taken together with the atom to which they attachedto form a 3- to 6-membered heterocyclyl optionally substituted byhalogen, oxo or C₁-C₆ alkyl optionally substituted by halogen or oxo;and

R¹⁵ and R¹⁶ are each independently hydrogen, C₁-C₆ alkyl optionallysubstituted by halogen or oxo, C₂-C₆ alkenyl optionally substituted byhalogen or oxo, or C₂-C₆ alkynyl optionally substituted by halogen oroxo;

or R¹⁵ and R¹⁶ are taken together with the atom to which they attachedto form a 3- to 6-membered heterocyclyl optionally substituted byhalogen, oxo or C₁-C₆ alkyl optionally substituted by oxo or halogen;

1, m, p and q are each independently 0, 1,2 or 3, provided that at leastone of m and 1 is not 0; and

n is 0, 1,2,3 or 4.

In some embodiments, provided is a compound of Formula (J):

or a salt thereof, wherein:

Z is

wherein

-   -   A is C₃-C₆ cycloalkyl, 4- to 7-membered heterocyclyl, 5- to        7-membered heteroaryl, or C₆ aryl, each of which is optionally        substituted with R⁵;    -   L is a bond, CH₂, NH, O, S, or SO;    -   B is hydrogen, C₃-C₆ cycloalkyl, 3- to 7-membered heterocyclyl,        5- to 7-membered heteroaryl, or C₆ aryl, each of which is        optionally substituted with R⁶;    -   C is C₃-C₆ cycloalkyl, 5- to 7-membered heterocyclyl, 5- to        7-membered heteroaryl, or C₆ aryl, each of which is optionally        substituted with R⁵, wherein C is fused to D; and    -   D is C₃-C₆ cycloalkyl, 3- to 7-membered heterocyclyl, 5- to        7-membered heteroaryl, or C₆ aryl, each of which is optionally        substituted with R⁶;

each X and Y are independently N or CH, provided that at least one of Xand Y is N;

R¹ is hydrogen, C₁-C₆ alkyl, C₂-C₆ alkenyl, C₂-C₆ alkynyl, C₁-C₈ alkoxy,C₃-C₆ cycloalkyl, 3- to 12-membered heterocyclyl, 5- to 10-memberedheteroaryl, C₆-C¹⁴ aryl, —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), —(C₁-C₃alkylene)(3- to 12-membered heterocyclyl), —C(O)R¹⁰, —(C₁-C₃alkylene)(5- to 10-membered heteroaryl) or —(C₁-C₃ alkylene)(C₆-C₁₄aryl), wherein R¹ is independently optionally substituted by halogen,oxo, —OR¹³, —NR¹³R¹⁴, —C(O)R¹³, —CN, C₃-C₈ cycloalkyl, or C₁-C₆ alkyloptionally substituted by oxo, —OH or halogen, provided that when Z is

n is 1 and R² is oxo, then R¹ is C₂-C₆ alkyl, C₂-C₆ alkenyl, C₂-C₆alkynyl, C₁-C₈ alkoxy, C₃-C₆ cycloalkyl, 3- to 12-membered heterocyclyl,5- to 10-membered heteroaryl, C₆-C¹⁴ aryl, —(C₁-C₃ alkylene)(C₃-C₆cycloalkyl), —C(O)R¹⁰, or —(C₁-C₃ alkylene)(C₆-C₁₄ aryl), wherein R₁ isindependently optionally substituted by halogen, oxo, OR¹³, —NR¹³R¹⁴,—C(O)R¹³, —CN, C₃-C₈ cycloalkyl, or C₁-C₆ alkyl optionally substitutedby oxo, —OH or halogen;

each R² is independently C₁-C₆ alkyl, oxo, —NR¹¹R¹², —CN, —C(O)R¹⁰,—C(O)NR¹¹R¹² or halogen, wherein any two R² groups are independentlyattached to same carbon or two different carbons;

each of R³ and R⁴ is independently C₁-C₆ alkyl, C₃-C₆ cycloalkyl, C₁-C₆haloalkyl, C₁-C₆ alkoxy, C₁-C₆haloalkoxy, halogen or —OH;

each R⁵ is independently C₁-C₆ alkyl, C₂-C₆ alkenyl, C₂-C₆ alkynyl,halogen, oxo, —CN, —OR¹⁰, —SR¹⁰, —NR¹¹R¹², —C(O)R¹⁰, —C(O)NR¹¹R¹²,—OC(O)NR¹¹R¹², —NR¹⁰C(O)R¹¹, —NR¹⁰C(O)NR¹¹R¹², —S(O)₂R¹⁰, —NR¹⁰S(O)₂R¹¹,—S(O)₂NR¹¹R¹², C₃-C₆ cycloalkyl, 3- to 12-membered heterocyclyl, —(C₁-C₃alkylene)OR¹⁰, —(C₁-C₃ alkylene)SR¹⁰, —(C₁-C₃ alkylene)NR¹¹R¹², —(C₁-C₃alkylene)C(O)R¹⁰, —(C₁-C₃ alkylene)C(O)NR¹¹R¹², —(C₁-C₃alkylene)NR¹⁰C(O)R¹¹, —(C₁-C₃ alkylene)NR¹⁰C(O)NR¹¹R¹², —(C₁-C₃alkylene)S(O)₂R¹⁰, —(C₁-C₃ alkylene)NR¹⁰S(O)₂R¹¹, —(C₁-C₃alkylene)S(O)₂NR¹¹R¹², —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), —(C₁-C₃alkylene)(3- to 12-membered heterocyclyl), wherein each R⁵ isindependently optionally substituted by halogen, oxo, —OR¹³, —NR¹³R¹⁴,—C(O)R¹³, —CN, —(C₁-C₃ alkylene)OR¹³, —(C₁-C₃ alkylene)NR¹³R¹⁴, —(C₁-C₃alkylene)C(O)R¹³, C₃-C₈ cycloalkyl, or C₁-C₆ alkyl optionallysubstituted by oxo, —OH or halogen;

each R⁶ is independently oxo or R⁷, or any two R⁶ groups, when bound tothe same carbon atom, are taken together with the carbon to which theyare attached to form a C₃-C₆ cycloalkyl;

R⁷ is independently hydrogen, C₁-C₆ alkyl, C₂-C₆ alkenyl, C₂-C₆ alkynyl,C₃-C₆ cycloalkyl, 3- to 6-membered heterocyclyl, —C(O)R¹⁰ ,—C(O)NR¹¹R¹², —(C₁-C₃ alkylene)CN, —(C₁-C₃ alkylene)OR¹⁰, —(C₁-C₃alkylene)SR¹⁰, —(C₁-C₃ alkylene)NR¹¹R¹², —(C₁-C₃ alkylene)CF₃, —(C₁-C₃alkylene)C(O)R¹⁰, —(C₁-C₃ alkylene)C(O)NR¹¹R¹², —(C₁-C₃alkylene)NR¹⁰C(O)R¹¹, —(C₁-C₃ alkylene)NR¹⁰C(O)NR¹¹R¹², —(C₁-C₃alkylene)S(O)₂R¹⁰, —(C₁-C₃ alkylene)NR¹⁰S(O)₂R¹¹, —(C₁-C₃alkylene)S(O)₂NR¹¹R¹², —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), or —(C₁-C₃alkylene)(3- to 6-membered heterocyclyl), wherein each R⁷ isindependently optionally substituted by halogen, oxo, —OR¹³, —NR¹³R¹⁴,—C(O)R¹³, —CN, —(C₁-C₃ alkylene)OR¹³, —(C₁-C₃ alkylene)NR¹³R¹⁴, —(C₁-C₃alkylene)C(O)R¹³, C₃-C₈ cycloalkyl, or C₁-C₆ alkyl optionallysubstituted by oxo, —OH or halogen;

R¹⁰ is independently hydrogen, C₁-C₆ alkyl, C₃-C₆ cycloalkyl, —(C₁-C₃alkylene)(C₃-C₆ cycloalkyl), C₆-C₁₄ aryl, 5- to 6-membered heteroaryl or3- to 6-membered heterocyclyl, each of which is independently optionallysubstituted by halogen, oxo, —CN, —OR¹⁵, —NR¹⁵R¹⁶, or C₁-C₆ alkyloptionally substituted by halogen, —OH or oxo;

R¹¹ and R¹² are each independently hydrogen, C₁-C₆ alkyl, C₃-C₆cycloalkyl, —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), C₆-C₁₄ aryl, 5- to6-membered heteroaryl or 3- to 6-membered heterocyclyl, each of which isindependently optionally substituted by halogen, oxo, —CN, —OR¹⁵,—NR¹⁵R¹⁶ or C₁-C₆ alkyl optionally substituted by halogen, —OH or oxo;

or R¹¹ and R¹² are taken together with the atom to which they attachedto form a 3- to 6-membered heterocyclyl optionally substituted byhalogen, oxo, or C₁-C₆ alkyl optionally substituted by halogen;

R¹³ and R¹⁴ are each independently hydrogen or C₁-C₆ alkyl, wherein theC₁-C₆ alkyl of R¹³ and R¹⁴ are optionally substituted by halogen, —OR¹⁵,—NR¹⁵R¹⁶, or oxo;

or R¹³ and R¹⁴ are taken together with the atom to which they attachedto form a 3- to 6-membered heterocyclyl optionally substituted byhalogen, oxo or C₁-C₆ alkyl optionally substituted by halogen or oxo;and

R¹⁵ and R¹⁶ are each independently hydrogen, C₁-C₆ alkyl optionallysubstituted by halogen or oxo, C₂-C₆ alkenyl optionally substituted byhalogen or oxo, or C₂-C₆ alkynyl optionally substituted by halogen oroxo;

or R¹⁵ and R¹⁶ are taken together with the atom to which they attachedto form a 3- to 6-membered heterocyclyl optionally substituted byhalogen, oxo or C₁-C₆ alkyl optionally substituted by oxo or halogen;

1, m, p and q are each independently 0, 1,2 or 3; and

n is 0, 1,2,3 or 4.

In some embodiments of Formula (J), Z is

and provides a compound of Formula (I):

or a salt thereof, wherein X, Y, A, B, L, R¹, R², R³, R⁴, R⁵, R⁶, 1, m,n, p and q are as detailed herein for Formula (J).

In some embodiments of Formula (J), Z is

and provides a compound of Formula (II):

or a salt thereof,wherein X, Y, C, D, R¹, R², R³, R⁴, R⁵, R⁶,1, m, n, pand q are as detailed herein for Formula (J).

Specific values listed below are values for a compound of Formula (J),Formula (I), or Formula (II) as well as all related formulae (e.g,Formula (I-A), (I-B1) to (I-B12), and (I-C1) to (I-C23)), or a saltthereof. It is to be understood that two or more values may combined.Thus, it is to be understood that any variable for a compound of Formula(J), Formula (I), or Formula (II) as well as all related formulae may becombined with any other variable for a compound of Formula (J), Formula(I), or Formula (II) as well as all related formulae the same as if eachand every combination of variables were specifically and individuallylisted. For example, it is understood that any specific value of R¹detailed herein for a compound of Formula (J), Formula (I), or Formula(II) as well as all related formulae may be combined with any otherspecific value for one or more of the variables A, B, C, D, X, Y, R²,R³, R⁴, R⁵, R⁶, 1, m, n, p, and q the same as if each and everycombination were specifically and individually listed.

In some embodiments of a compound of Formula (I), A is C₃-C₆ cycloalkyl,4- to 7-membered heterocyclyl, 5- to 7-membered heteroaryl or C₆ aryl,each of which is unsubstituted. In some embodiments of a compound ofFormula (I), A is C₃-C₆ cycloalkyl, 4- to 7-membered heterocyclyl, 5- to7-membered heteroaryl or C₆ aryl, each of which is optionallysubstituted with R⁵. In some embodiments of a compound of Formula (I), Ais C₆ aryl optionally further substituted with R⁵. In some embodimentsof a compound of Formula (I), A is phenyl optionally substituted withR⁵. In some embodiments of a compound of Formula (I), A is 5- to7-membered heteroaryl optionally further substituted with R⁵. In someembodiments of a compound of Formula (I), A is selected from the groupconsisting of pyridine, pyrimidine, pyrazolyl, thiazolyl, oxazolyl,isooxazolyl or imidazolyl, each of which is optionally substituted withR⁵. In some embodiments of a compound of Formula (I), A is 4- to7-membered heterocyclyl, optionally further substituted with R⁵. In someembodiments of a compound of Formula (I), A is piperidinyl,pyrrolidinyl, azetidinyl, dihydropyridine, or pyridone, each ofoptionally substituted with R⁵. In some embodiments of a compound ofFormula (I), A is C₃-C₆ cycloalkyl substituted with R⁵. In someembodiments A is cyclohexyl or cyclopentyl, each of optionallysubstituted with R⁵. In some embodiments of a compound of Formula (I), Ais phenyl, pyridine, pyrimidine, pyrazolyl, thiazolyl, oxazolyl,isooxazolyl, imidazolyl, piperidinyl, pyrrolidinyl, azetidinyl,pyridone, cyclohexyl, or cyclopentyl, each of which is unsubstituted. Insome embodiments of a compound of Formula (I), A is phenyl, pyridine,pyrimidine, pyrazolyl, thiazolyl, oxazolyl, isooxazolyl, imidazolyl,piperidinyl, pyrrolidinyl, azetidinyl, dihydropyridine, pyridone,cyclohexyl, or cyclopentyl, each of which is optionally substituted withR⁵.

In some embodiments of a compound of Formula (I), B is hydrogen, C₃-C₆cycloalkyl, 3- to 7-membered heterocyclyl, 5- to 7-membered heteroaryl,or C₆ aryl, each of which is optionally substituted with R⁶. In someembodiments of a compound of Formula (I), B is C₃-C₆ cycloalkyl, 3- to7-membered heterocyclyl, 5- to 7-membered heteroaryl, or C₆ aryl, eachof which is unsubstituted. In some embodiments of a compound of Formula(I), B is hydrogen. In some embodiments of a compound of Formula (I), Bis 3- to 7-membered heterocyclyl optionally substituted with R⁶. In someembodiments of a compound of Formula (I), B is diazepanyl, azepanyl,piperazinyl, piperidinyl, pyrrolidinyl or azetidinyl, each of which isoptionally substituted with R⁶. In some embodiments of a compound ofFormula (I), B is 5- to 7-membered heteroaryl optionally substitutedwith R⁶. In some embodiments of a compound of Formula (I), B isimidazolyl or pyrazolyl, each of which is optionally substituted withR⁶. In some embodiments of a compound of Formula (I), B is phenyloptionally substituted with R⁶. In some embodiments of a compound ofFormula (I), B is C₃-C₆ cycloalkyl optionally substituted with R⁶. Insome embodiments of a compound of Formula (I), B is cyclopentyl,cyclohexyl, or cycloheptyl, each of which is optionally substituted withR⁶. In some embodiments of a compound of Formula (I), B is hydrogen,diazepanyl, azepanyl, piperazinyl, piperidinyl, pyrrolidinyl,azetidinyl, imidazolyl, pyrazolyl, phenyl, cyclopentyl, cyclohexyl, orcycloheptyl, each of which is unsubstituted. In some embodiments of acompound of Formula (I), B is hydrogen, diazepanyl, azepanyl,piperazinyl, piperidinyl, pyrrolidinyl, azetidinyl, imidazolyl,pyrazolyl, phenyl, cyclopentyl, cyclohexyl, or cycloheptyl, each ofwhich is optionally substituted with R⁶.

In some embodiments of a compound of Formula (I), L is a bond, —CH₂—,—NH—, —O—, —S—, —SO₂—, —CO—, —NCH₃—, —SO₂NH—, or —NHSO₂—. In someembodiments of a compound of Formula (I), L is a bond, —CH₂—, —NH—, —O—,or —S—. In some embodiments, L is a bond. In some embodiments, L is—CH₂—. In some embodiments, L is —NH—. In some embodiments, L is —S—. Insome embodiments, L is —O—. In some embodiments, L is —SO₂—. In someembodiments, L is —CO—. In some embodiments, L is —NCH₃—. In someembodiments, L is —NHSO₂—. In some embodiments, L is —CR¹¹R¹²—. In someembodimetns, L is —NR¹⁰—. In some embodimetns, L is —NR¹⁰SO₂—. In someembodimetns, L is —SO₂NR¹⁰—. In some embodiments, L is —SO₂NH—.

It is understood that any description of A for Formula (I) may becombined with any description of B and L for formula (I), the same as ifeach and every combination were specifically and individually listed.

In some embodiments of a compound of Formula (II), D is fused with C toform a 7-12 membered bicyclic ring having at least one aromatic ring,wherein C and D are optionally substituted with R⁵ and R⁶. In someembodiments of a compound of Formula (II), D is fused with C to form a7-12 membered bicyclic ring having at least one aromatic ring and atleast one heteroatom selected from the group consisting of N, O, and S,wherein C and D are optionally substituted with R⁵ and R⁶. In someembodiments of a compound of Formula (II), D is fused with C to form a7-12 membered bicyclic ring having at least one aromatic ring and atleast one nitrogen atom, wherein C and D are optionally substituted withR⁵ and R⁶. In some embodiments of a compound of Formula (II), D is fusedwith C to form a 7-12 membered bicyclic ring having at least onearomatic ring and at least one nitrogen atom, wherein C and D areoptionally substituted with R⁵ and R⁶.

In some embodiments, provided is a compound of Formula (I-A),

or a salt thereof, wherein A, B, X, Y; R¹, R², R³, R⁴, R⁵, R⁶, 1, m, n,p, and q are as detailed herein for Formula (I).

In some embodiments, provided is a compound of any one of Formula (I-B1)to (I-B12), or a salt thereof:

wherein X, Y, A, B, L, R¹, R², R³, R⁴, R⁵, R⁶, R⁷, 1, m, n, p, and q areas described herein for Formula (I) and t is 0, 1,2 or 3. In someembodiments, t is 0. In some embodiments, t is 0 or 1. In someembodiments, t is 0, 1, or 2.

In some embodiments, provided is a compound of any one of Formula (I-C1)to (I-C23):

or a salt thereof, wherein X, Y, R¹, R², R³, R⁴, R⁵, R⁶, R⁷, 1, m, n, p,and q are as described herein for Formula (I) and t and t′ are eachindependently 0, 1,2, or 3. In some embodiments, t is 0. In someembodiments, t is 0 or 1. In some embodiments, t is 0, 1, or 2. In someembodiments, t′ is 0. In some embodiments, t′ is 0 or 1. In someembodiments, t′ is 0, 1, or 2.

In some embodiments of a compound of Formula (I), R⁷ is hydrogen, C₁-C₆alkyl, C₃-C₆ cycloalkyl, —C(O)R¹⁰, each of which (except hydrogen) isoptionally substituted by halogen, oxo, —OR¹³, —NR¹³R¹⁴, —C(O)R¹³, —CN,—(C₁-C₃ alkylene)OR¹³, —(C₁-C₃ alkylene)NR¹³R¹⁴, —(C₁-C₃alkylene)C(O)R¹³, C₃-C₈ cycloalkyl, or C₁-C₆ alkyl optionallysubstituted by oxo, —OH or halogen. In some embodiments of a compound ofFormula (I), R⁷ is hydrogen, methyl, ethyl, isopropyl, cyclopropyl,—C(O)CH₂NHCH₃, or —CH₂CH₂OH.

In some embodiments, provided is a compound of Formula (II):

or a salt thereof, wherein C-D, X, Y, R¹, R², R³, R⁴, R⁵, R⁶, 1, m, n, pand q are as described for Formula (II).

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), X is N and Y is N. In some embodiments of a compound ofFormula (J), Formula (I), or Formula (II), X is N and Y is CH. In someembodiments of a compound of Formula (J), Formula (I), or Formula (II),X is CH and Y is N.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), R¹is hydrogen, C₁-C₆ alkyl, C₂-C₆ alkenyl, C₂-C₆ alkynyl,C₁-C₈ alkoxy, C₃-C₆ cycloalkyl, 3- to 12-membered heterocyclyl, 5- to10-membered heteroaryl, C₆-C₁₄ aryl, —C(O)R¹⁰, —(C₁-C₃ alkylene)(C₃-C₆cycloalkyl), —(C₁-C₃ alkylene)(3- to 12-membered heterocyclyl), —(C₁-C₃alkylene)(5- to 10-membered heteroaryl) or —(C₁-C₃ alkylene)(C₆-C₁₄aryl), each of which is optionally substituted by halogen, oxo, —OR¹³,—C(O)NR¹³R¹⁴, —NR¹³R¹⁴, —C(O)R¹³, —CN, C₃-C₈ cycloalkyl, or C₁-C₆ alkyloptionally substituted by oxo, —OH or halogen. In some embodiments of acompound of Formula (J), Formula (I), or Formula (II), R¹ is hydrogen,C₁-C₆ alkyl, C₃-C₆ cycloalkyl, 3- to 12-membered heterocyclyl, 5- to10-membered heteroaryl, C₆-C₁₄ aryl, —C(O)R¹⁰, —(C₁-C₃ alkylene)(C₃-C₆cycloalkyl), —(C₁-C₃ alkylene)(3- to 12-membered heterocyclyl), —(C₁-C₃alkylene)(5- to 10-membered heteroaryl) or —(C₁-C₃ alkylene)(C₆-C₁₄aryl), each of which is unsubstituted. In some embodiments of a compoundof Formula (J), Formula (I), or Formula (II), R¹ is C₂-C₆ alkyl, C₂-C₆alkenyl, C₂-C₆ alkynyl, C₁-C₈ alkoxy, C₃-C₆ cycloalkyl, 3- to12-membered heterocyclyl, 5- to 10-membered heteroaryl, C₆-C¹⁴ aryl,—(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), —C(O)R¹⁰, or —(C₁-C₃alkylene)(C₆-C₁₄ aryl), wherein R₁ is independently optionallysubstituted by halogen, oxo, —OR¹³, —NR¹³R¹⁴, —C(O)R¹³, —CN, C₃-C₈cycloalkyl, or C₁-C₆ alkyl optionally substituted by oxo, —OH orhalogen. In some embodiments of a compound of Formula (J), Formula (I),or Formula (II), R¹ is C₂-C₆ alkyl, C₂-C₆ alkenyl, C₂-C₆ alkynyl, C₁-C₈alkoxy, C₃-C₆ cycloalkyl, 3- to 12-membered heterocyclyl, 5- to10-membered heteroaryl, C₆-C¹⁴ aryl, or —C(O)R¹⁰, wherein R₁ isindependently optionally substituted by halogen, oxo, —OR¹³, —NR¹³R¹⁴,—C(O)R¹³, —CN, C₃-C₈ cycloalkyl, or C₁-C₆ alkyl optionally substitutedby oxo, —OH or halogen. In some embodiments of a compound of Formula(J), Formula (I), or Formula (II), R¹ is hydrogen, C₁-C₆ alkyl,—C(O)R¹⁰, —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), —(C₁-C₃ alkylene)(5- to10-membered heteroaryl), or C₃-C₆ cycloalkyl, each of which isoptionally substituted with halogen, oxo, —NH₂. In some embodiments, R¹is methyl, ethyl, n-propyl, isopropyl, cyclopropyl, cyclopentyl,cyclohexyl or cyclopropyl-methyl. In some embodiments, R¹ is isopropyl.In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), R¹ is C₂-C₆ alkyl.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), R¹ is selected from the group consisting of

wherein the wavy lines denote attachment points to the parent molecule.

In some embodiments, R¹ is selected from the group consisting of

wherein the wavy lines denote attachment points to the parent molecule.In some embodiments, R¹ is

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), n is 0. In some embodiments, n is 0 or 1. In someembodiments, n is 0, 1, or 2. In some embodiments, n is 0, 1,2, or 3.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), each R² is independently C₁-C₆ alkyl, oxo, —NR¹¹R¹², —CN,or halogen. In some embodiments, each R² is independently C₁-C₆ alkyl,oxo, or halogen. In some embodiments of a compound of Formula (J),Formula (I), or Formula (II), R² is oxo. In some embodiments of acompound of Formula (J), Formula (I), or Formula (II), R² is —NR¹¹R¹².In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), R² is —CN. In some embodiments of a compound of Formula(J), Formula (I), or Formula (II), R² is —C(O)R¹⁰. In some embodimentsof a compound of Formula (J), Formula (I), or Formula (II), R² is—C(O)NR¹¹R¹². In some embodiments of a compound of Formula (J), Formula(I), or Formula (II), R² is halogen, such as fluoro. In some embodimentsof a compound of Formula (J), Formula (I), or Formula (II), R² is C₁-C₆alkyl, preferably methyl or dimethyl attached to the same carbon. Insome embodiments of a compound of Formula (J), Formula (I), or Formula(II), groups of R² (such as when more than one R² is present) are oxoand methyl, independently attached to two different carbons. In someembodiments of a compound of Formula (J), Formula (I), or Formula (II),groups of R² are oxo and dimethyl, each independently attached to twodifferent carbons. In some embodiments of a compound of Formula (J),Formula (I), or Formula (II), groups of R² are oxo and —CN, eachindependently attached to two different carbons. In some embodiments ofa compound of Formula (J), Formula (I), or Formula (II), groups of R²are oxo and —NR¹¹, R¹², each independently attached to two differentcarbons. In some embodiments of a compound of Formula (J), Formula (I),or Formula (II), groups of R² are oxo and —C(O)R¹⁰, each independentlyattached two different carbon. In some embodiments of a compound ofFormula (J), Formula (I), or Formula (II), groups of R² are oxo and—C(O)NR¹¹R¹²each independently attached to two different carbons. Insome embodiments of a compound of Formula (J), Formula (I), or Formula(II), groups of R² are difluoro attached to the same carbon. In someembodiments of a compound of Formula (J), Formula (I), or Formula (II),groups of R² are oxo and fluoro or difluoro, each independently attachedto two different carbons. In some embodiments of a compound of Formula(J), Formula (I), or Formula (II), R² is H.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), m is 0. In some embodiments, m is 0 or 1. In someembodiments, m is 0, 1, or 2. In some embodiments, m is 0, 1,2, or 3. Insome embodiments, m is 0, 1,2, or 3, provided that at least one of m and1 is not 0.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), each R³ is independently C₁-C₆ alkyl, C₃-C₆ cycloalkyl,C₁-C₆haloalkyl, C₁-C₆ alkoxy, C₁-C₆ haloalkoxy, halogen, or —OH. In someembodiments, each R³ is independently C₁-C₆ alkyl, C₃-C₆ cycloalkyl,C₁-C₆ haloalkyl, C₁-C₆alkoxy, C₁-C₆ haloalkoxy or halogen. In someembodiments, each R³ is independently fluoro, chloro, methyl,trifluoromethyl, trifluoromethoxy, methoxy, and cyclopropyl. In someembodiments, R³ is halogen.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), 1 is 0. In some embodiments, 1 is 0 or 1. In someembodiments, 1 is 0, 1, or 2. In some embodiments, 1 is 0, 1,2, or 3. Insome embodiments, 1 is 0, 1,2, or 3, provided that when Z is

n is 1 and R² is oxo, then at least one of m and 1 is not 0. In someembodiments, 1 is 0, 1,2, or 3, provided that at least one of m and 1 isnot 0.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), each R⁴ is independently C₁-C₆ alkyl, C₃-C₆ cycloalkyl,C₁-C₆ haloalkyl, C₁-C₆ alkoxy, C₁-C₆ haloalkoxy, halogen, or —OH. Insome embodiments, each R⁴ is independently C₁-C₆ alkyl, C₃-C₆cycloalkyl, C₁-C₆ haloalkyl, C₁-C₆alkoxy, C₁-C₆ haloalkoxy or halogen.In some embodiments, each R⁴ is independently fluoro, chloro, methyl,trifluoromethyl, trifluoromethoxy, methoxy, or cyclopropyl. In someembodiments, R⁴ is halogen.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), each R³ and R⁴ is independently C₁-C₆ alkyl, C₃-C₆cycloalkyl, C₁-C₆ haloalkyl, C₁-C₆ alkoxy, C₁-C₆ haloalkoxy, halogen, or—OH and 1 and m are independently 0, 1,2 or 3. In some embodiments of acompound of Formula (J), Formula (I), or Formula (II), each R³ and R⁴ isindependently C₁-C₆ alkyl, C₃-C₆ cycloalkyl, C₁-C₆ haloalkyl, C₁-C₆alkoxy, C₁-C₆ haloalkoxy, halogen, or —OH and 1 and m are independently0, 1,2 or 3, provided that when Z is

n is 1 and R² is oxo, then at least one of m and 1 is not 0. In someembodiments of a compound of Formula (J), Formula (I), or Formula (II),each R³ and R⁴ is independently C₁-C₆ alkyl, C₃-C₆ cycloalkyl, C₁-C₆haloalkyl, C₁-C₆ alkoxy, C₁-C₆ haloalkoxy, halogen, or —OH and 1 and mare independently 0, 1,2 or 3, provided that at least one of m and 1 isnot 0. In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), R³ and R⁴ are halogen. In some embodiments of a compoundof Formula (J), Formula (I), or Formula (II), R³ is F and R⁴ is Cl. Insome embodiments of a compound of Formula (J), Formula (I), or Formula(II), R³ is Cl and R⁴ is F. In some embodiments, both R³ and R⁴ are F.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), X is CH; Y is N; and R³ and R⁴ are independently C₁-C₆alkyl, C₃-C₆ cycloalkyl, C₁-C₆haloalkyl, C₁-C₆ alkoxy, C₁-C₆ haloalkoxy,halogen or —OH. In some embodiments of a compound of Formula (J),Formula (I), or Formula (II), X is N; Y is CH; and R³ and R⁴ areindependently hydrogen, C₁-C₆ alkyl, C₃-C₆ cycloalkyl, C₁-C₆ haloalkyl,C₁-C₆ alkoxy, C₁-C₆ haloalkoxy, halogen or —OH. In some embodiments of acompound of Formula (J), Formula (I), or Formula (II), X is N; Y is N;and R³ and R⁴ are independently hydrogen, C₁-C₆ alkyl, C₃-C₆ cycloalkyl,C₁-C₆haloalkyl, C₁-C₆ alkoxy, C₁-C₆haloalkoxy, halogen or —OH.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), X is CH; Y is N; R³ is F; and R⁴ is F. In some embodimentsof a compound of Formula (J), Formula (I), or Formula (II), X is N; Y isCH; R³ is F; and R⁴ is F. In some embodiments of a compound of Formula(J), Formula (I), or Formula (II), X is N; Y is N; R³ is Cl; and R⁴ isF. In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), X is N; Y is N; R³ is F; and R⁴ is Cl. In some embodimentsof a compound of Formula (J), Formula (I), or Formula (II), X is CH; Yis N; R³ is Cl; and R⁴ is F. In some embodiments of a compound ofFormula (J), Formula (I), or Formula (II), X is CH; Y is N; R³ is F; andR⁴ is Cl. In some embodiments of a compound of Formula (J), Formula (I),or Formula (II), X is N; Y is CH; R³ is Cl; and R⁴ is F. In someembodiments of a compound of Formula (J), Formula (I), or Formula (II),X is N; Y is CH; R³ is F; and R⁴ is Cl. In some embodiments of acompound of Formula (J), Formula (I), or Formula (II), X is N; Y is N;R³ is F; and R⁴ is F.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), X is CH; Y is N; R³ is F and R⁴ is F; and each R² isindependently hydrogen, C₁-C₆ alkyl, oxo, —NR¹¹R¹², —CN, —C(O)R¹⁰,—C(O)NR¹¹R¹² or halogen. In some embodiments of a compound of Formula(J), Formula (I), or Formula (II), X is N; Y is CH; R³ is F and R⁴ is F;and each R² is independently hydrogen, C₁-C₆ alkyl, oxo, —NR¹¹R¹², —CN,—C(O)R¹⁰, —C(O)NR¹¹R¹² or halogen. In some embodiments of a compound ofFormula (J), Formula (I), or Formula (II), X is N; Y is N; R³ is F andR⁴ is F; and each R² is independently hydrogen, C₁-C₆ alkyl, oxo—NR¹¹R¹², —CN, —C(O)R¹⁰, C(O)NR¹¹R¹² or halogen. In some embodiments ofa compound of Formula (J), Formula (I), or Formula (II), X is N; Y is N;R³ is F; R⁴ is F; and each R² is independently F, wherein each F isattached to same carbon or two different carbons. In some embodiments ofa compound of Formula (J), Formula (I), or Formula (II), X is N; Y is N;R³ is F; R⁴ is F; and each R² is independently C₁-C₆ alkyl, preferablymethyl, each methyl attached to same carbon or two different carbon. Insome embodiments of a compound of Formula (J), Formula (I), or Formula(II), X is N; Y is N; R³ is F; R⁴ is F; each R² is oxo or methyl, eachof which is attached to two different carbons. In some embodiments of acompound of Formula (J), Formula (I), or Formula (II), X is N; Y is N;R³ is F; R⁴ is F; and each R² is oxo or F, which are attached to twodifferent carbons. In some embodiments of a compound of Formula (J),Formula (I), or Formula (II), X is N; Y is N; R³ is F; R⁴ is F; R² isoxo. In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), X is N; Y is N; R³ is F; R⁴ is F; each R² is independentlyhydrogen.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), X is N; Y is N; each R³ and R⁴is independently C₁-C₆alkyl,C₃-C₆ cycloalkyl, C₁-C₆haloalkyl, C₁-C₆ alkoxy, C₁-C₆ haloalkoxy,halogen, or —OH; each R² is independently hydrogen, C₁-C₆ alkyl, oxo,—NR¹¹R¹², —CN, —C(O)R¹⁰, —C(O)NR¹¹R¹² or halogen, any two R² groups areindependently attached to same carbon or two different carbon; and R¹ishydrogen, C₁-C₆ alkyl, C₂-C₆ alkenyl, C₂-C₆ alkynyl, C₁-C₈ alkoxy, C₃-C₆cycloalkyl, 3- to 12-membered heterocyclyl, 5- to 10-memberedheteroaryl, C₆-C₁₄ aryl, —C(O)R¹⁰, —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl),—(C₁-C₃ alkylene)(3- to 12-membered heterocyclyl), —(C₁-C₃ alkylene)(5-to 10-membered heteroaryl) or —(C₁-C₃ alkylene)(C₆-C₁₄ aryl), each ofwhich is optionally substituted by halogen, oxo, —OR¹³, —C(O)NR¹³R¹⁴,—NR¹³R¹⁴, —C(O)R¹³, —CN, C₃-C₈ cycloalkyl, or C₁-C₆ alkyl optionallysubstituted by oxo, —OH or halogen.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), X is CH; Y is N; each R³ and R⁴is independentlyC₁-C₆alkyl, C₃-C₆ cycloalkyl, C₁-C₆haloalkyl, C₁-C₆ alkoxy, C₁-C₆haloalkoxy, halogen, or —OH; each R² is independently hydrogen, C₁-C₆alkyl, oxo, —NR¹¹R¹², —CN, —C(O)R¹⁰, —C(O)NR¹¹R¹² or halogen, any two R²groups are independently attached to same carbon or two differentcarbon; R¹is C₁-C₆ alkyl, C₃-C₆ cycloalkyl, 3- to 12-memberedheterocyclyl, —C(O)R¹⁰, —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), —(C₁-C₃alkylene)(3- to 12-membered heterocyclyl), or —(C₁-C₃ alkylene)(C₆-C₁₄aryl), each of which is optionally substituted by halogen, oxo, —OR¹³,—C(O) NR¹³R¹⁴, —NR¹³R¹⁴, —C(O)R¹³, —CN, C₃-C₈ cycloalkyl, or C₁-C₆ alkyloptionally substituted by oxo, —OH or halogen.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), X is N; Y is CH; each R³ and R⁴is independentlyC₁-C₆alkyl, C₃-C₆ cycloalkyl, C₁-C₆haloalkyl, C₁-C₆ alkoxy, C₁-C₆haloalkoxy halogen, or —OH; each R² is independently hydrogen, C₁-C₆alkyl, oxo, —NR¹¹R¹², —CN, —C(O)R¹⁰, —C(O)NR¹¹R¹² or halogen, any two R²groups are independently attached to same carbon or two differentcarbon; R¹is C₁-C₆ alkyl, C₃-C₆ cycloalkyl, 3- to 12-memberedheterocyclyl, —C(O)R¹⁰, —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), —(C₁-C₃alkylene)(3- to 12-membered heterocyclyl), or —(C₁-C₃ alkylene)(C₆-C₁₄aryl), each of which is optionally substituted by halogen, oxo, —OR¹³,—C(O) NR¹³R¹⁴, —NR¹³R¹⁴, —C(O)R¹³, —CN, C₃-C₈ cycloalkyl, or C₁-C₆ alkyloptionally substituted by oxo, —OH or halogen.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), X is N; Y is N; each R³ and R⁴ is independently F; each R²is independently hydrogen, C₁-C₆ alkyl, oxo, —NR¹¹R¹², —CN, —C(O)R¹⁰,—C(O)NR¹¹R¹² or halogen, any two R² groups are independtly attached tosame carbon or two different carbon; R¹is hydrogen, C₁-C₆ alkyl, C₂-C₆alkenyl, C₂-C₆ alkynyl, C₁-C₈ alkoxy, C₃-C₆ cycloalkyl, 3- to12-membered heterocyclyl, 5- to 10-membered heteroaryl, C₆-C₁₄ aryl,—(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), —(C₁-C₃ alkylene)(3- to 12-memberedheterocyclyl), —(C₁-C₃ alkylene)(5- to 10-membered heteroaryl) or—(C₁-C₃ alkylene)(C₆-C₁₄ aryl), each of which is optionally substitutedby halogen, oxo, —OR¹³, —C(O)NR¹³R¹⁴, —NR¹³R¹⁴, —C(O)R¹³, —CN, C₃-C₈cycloalkyl, or C₁-C₆ alkyl optionally substituted by oxo, —OH orhalogen.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), X is N; Y is N; each R³ and R⁴ is independently F; each R²is independently hydrogen, C₁-C₆ alkyl, oxo, —NR¹¹R¹³, —CN, —C(O)R¹⁰,—C(O)NR¹¹R¹² or halogen, any two R² groups are independently attached tosame carbon or two different carbon; R¹is C₁-C₆ alkyl, C₃-C₆ cycloalkyl,3- to 12-membered heterocyclyl, —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl),—(C₁-C₃ alkylene)(3- to 12-membered heterocyclyl), or —(C₁-C₃alkylene)(C₆-C₁₄ aryl), each of which is optionally substituted byhalogen, oxo, —OR¹³, —C(O)NR¹³R¹⁴, —NR¹³R¹⁴, —C(O)R¹³, —CN, C₃-C₈cycloalkyl, or C₁-C₆ alkyl optionally substituted by oxo, —OH orhalogen.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), X is N; Y is N; each R³ and R⁴ is independently F; each R²is independently hydrogen or C₁-C₆ alkyl, any two R² groups areindependently attached to same carbon or two different carbon; R¹isC₁-C₆ alkyl, C₃-C₆ cycloalkyl, 3- to 12-membered heterocyclyl, —(C₁-C₃alkylene)(C₃-C₆ cycloalkyl, —(C₁-C₃alkylene)(3- to 12-memberedheterocyclyl, —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), —(C₁-C₃ alkylene)(3-to 12-membered heterocyclyl), or —(C₁-C₃ alkylene)(C₆-C₁₄ aryl), each ofwhich is optionally substituted by halogen, oxo, —OR¹³, —C(O)NR¹³R¹⁴,—NR¹³R¹⁴, —C(O)R¹³, —CN, C₃-C₈ cycloalkyl, or C₁-C₆ alkyl optionallysubstituted by oxo, —OH or halogen.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), X is N; Y is N; each R³ and R⁴is independently F; each R²is independently hydrogen or C₁-C₆ alkyl, any two R² groups areindependently attached to same carbon or two different carbon; R¹ isC₁-C₆ alkyly, C₃-C₆ cycloalkyl, —(C₁-C₃ alkylene), (C₃-C₆ cycloalkyl) or—(C₁-C₃ alkylene)(C₆-C₁₄ aryl), each of which is optionally substitutedby halogen, oxo, —OR¹³, —C(O) NR¹³R¹⁴, —NR¹³R¹⁴, —C(O)R¹³, —CN, C₃-C₈cycloalkyl, or C₁-C₆ alkyl optionally substituted by oxo, —OH orhalogen.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), X is N; Y is N; each R³ and R⁴is independently F; each R²is independently hydrogen or C₁-C₆ alkyl, any two R² groups areindependently attached to same carbon or two different carbon; R¹ isC₁-C₆ alkyl, C₃-C₆ cycloalkyl or —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl),each of which is optionally substituted by halogen, oxo, —OR¹³, —NR¹³R¹⁴or C₁-C₆ alkyl optionally substituted by oxo, —OH or halogen.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), X is N; Y is N; each R³ and R⁴is independently F; each R²is independently hydrogen; R¹ is C₁-C₆ alkyl or C₃-C₆ cycloalkyl,wherein R¹ is independently optionally substituted by halogen, oxo,—OR¹³, —NR¹³R¹⁴ or C₁-C₆ alkyl optionally substituted by oxo, —OH orhalogen. In some embodiments of a compound of Formula (J), Formula (I),or Formula (II), X is N; Y is N; each R³ and R⁴is independently F; eachR² is independently hydrogen; R¹ is C₁-C₆ alkyl, wherein R¹ isindependently optionally substituted by halogen, oxo, —OR¹³, —NR¹³R¹⁴ orC₁-C₆ alkyl optionally substituted by oxo, —OH or halogen. In someembodiments of a compound of Formula (J), Formula (I), or Formula (II),X is N; Y is N; each R³ and R⁴is independently F; each R² isindependently hydrogen; R¹ is selected from the group consisting of:

wherein the wavy lines denote attachment points to the parent molecule.In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), X is N; Y is N; each R³ and R⁴ is independently F; each R²is independently hydrogen; R¹ is selected from the group consisting of:

wherein the wavy lines denote attachment points to the parent molecule.In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), X is N; Y is N; each R³ and R⁴ is independently F; each R²is independently hydrogen; R¹ is C₁-C₆ alkyl.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), p is 0. In some embodiments of a compound of Formula (J),Formula (I), or Formula (II), p is 0 or 1. In some embodiments of acompound of Formula (J), Formula (I), or Formula (II), p is 0, 1, or 2.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), each R⁵ is independently C₁-C₆ alkyl, halogen, oxo, —CN,—OR¹⁰, —NR¹¹R¹², —C(O)R¹⁰, —C(O)NR¹¹R¹², C₃-C₆ cycloalkyl, 3- to12-membered heterocyclyl, —(C₁-C₃ alkylene)OR¹⁰, —(C₁-C₃alkylene)NR¹¹R¹², —(C₁-C₃ alkylene)C(O)R¹⁰, —(C₁-C₃ alkylene)(C₃-C₆cycloalkyl), —(C₁-C₃ alkylene)(3- to 12-membered heterocyclyl), each ofwhich is optionally substituted by halogen, oxo, —OR¹³, —NR¹³R¹⁴,—C(O)R¹³, —CN, —(C₁-C₃ alkylene)OR¹³, —(C₁-C₃ alkylene)NR¹³R¹⁴, —(C₁-C₃alkylene)C(O)R¹³, C₃-C₈ cycloalkyl, or C₁-C₆ alkyl optionallysubstituted by oxo, —OH or halogen. In some embodiments, each R⁵ isindependently —CN, halogen, methoxy, oxo, trifluoromethoxy, —NH(CH₃),—N(CH₃)₂, —(CH₂)NH(CH₃), —(CH₂)NH₂, —(CH₂)N(CH₃)₂, —C(O)NH₂,—C(O)N(CH₃)₂, methyl, ethyl, isopropyl, cyclopropyl, —CH₂OH, —CH₂OCH₃,—NH(CH₂)₂N(CH₂CH₃)₂, —O(CH₂)₂N(CH₂CH₃)₂, or trifluoromethyl. In someembodiments, each R⁵ is independently —CN, halogen, methoxy, oxo,trifluoromethoxy, —NH(CH₃), —N(CH₃)₂, —(CH₂)NH(CH₃), —(CH₂)NH₂,—(CH₂)N(CH₃)₂, —C(O)NH₂, —C(O)N(CH₃)₂, methyl, ethyl, isopropyl,n-propyl, cyclopropyl, —CH₂OH, —CH₂OCH₃, —NH(CH₂)₂N(CH₂CH₃)₂,—O(CH₂)₂N(CH₂CH₃)₂, trifluoromethyl,

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), q is 0. In some embodiments of a compound of Formula (J),Formula (I), or Formula (II), q is 0 or 1. In some embodiments of acompound of Formula (J), Formula (I), or Formula (II), q is 0, 1, or 2.

In some embodiments of a compound of Formula (J), Formula (I), orFormula (II), each R⁶ is independently C₁-C₆ alkyl, halogen, oxo, —CN,—NR¹¹R¹², —C(O)R¹⁰, C₃-C₆ cycloalkyl, 3- to 12-membered heterocyclyl,—(C₁-C₃ alkylene)OR¹⁰, —(C₁-C₃ alkylene)NR¹¹R¹², each of which isoptionally substituted by halogen, oxo, —OR¹³, —NR¹³R¹⁴, —C(O)R¹³, —CN,—(C₁-C₃ alkylene)OR¹³, —(C₁-C₃ alkylene)NR¹³R¹⁴, —(C₁-C₃alkylene)C(O)R¹³, C₃-C₈ cycloalkyl, or C₁-C₆ alkyl optionallysubstituted by oxo, —OH or halogen; or two R⁶ groups when bound to thesame carbon atom, are taken together with the carbon to which they areattached to form a C₃-C₆ cycloalkyl. In some embodiments, each R⁶ isindependently ethyl, methyl, isopropyl, pyrrolidinyl, —N(CH₃)₂, —CH₂OH,oxo, —C(O)CH₂NHCH₃, —CH₂CH₂OH, difluoroethyl, —CH₂N(CH₃)₂, —OH, or—C(O)CH₂OH. In some embodiments, each R⁶ is independently ethyl, methyl,isopropyl, pyrrolidinyl, cyclopropyl, methoxy, —N(CH₃)₂, —NHCH₃, —CH₂OH,oxo, —C(O)CH₂NHCH₃, —CH₂CH₂OH, difluoroethyl, —CH₂N(CH₃)₂, —CH₂NH₂, —OH,—C(O)CH₂OH, —C(O)CH₂N(CH₃)₂, —C(O)N(CH₃)₂, —C(O)NHCH₃, —C(O)NH₂,—NHC(O)CH₃, —C(O)CH₃, —S(O)₂CH₃,

In some embodiments of a compound of Formula (I), A, L, and B togetherwith R⁵ and R⁶ are selected from the group consisting of:

wherein the wavy lines denote attachment points to the parent moleculeand R⁷ is as described herein. It is understood that each description ofA and B may be combined with each description of X, Y, R², R³, R⁴, R⁵,R⁶, 1, m, n, p, and q the same as if each and every combination werespecifically and individually listed.

In some embodiments of a compound of Formula (I), A and B together withR⁵ and R⁶ are selected from the group consisting of:

wherein the wavy lines denote attachment points to the parent moleculeand R⁷ is as described herein. It is understood that each description ofA and B may be combined with each description of X, Y, R², R³, R⁴, R⁵,R⁶, 1, m, n, p, and q the same as if each and every combination werespecifically and individually listed.

In some embodiments of a compound of Formula (II), C-D are selected fromthe group consisting of:

wherein the wavy lines denote attachment points to the parent molecule.

In some embodiments of a compound of Formula (II), C-D are selected fromthe group consisting of:

wherein the wavy lines denote attachment points to the parent molecule.

In some embodiments of a compound of Formula (II), C-D are selected fromthe group consisting of:

wherein the wavy lines denote attachment points to the parent molecule.

In some embodiments of a compound of Formula (II), C-D are selected fromthe group consisting of:

wherein the wavy lines denote attachment points to the parent molecule.

In some embodiments of a compound of Formula (II), C-D are selected fromthe group consisting of:

wherein the wavy lines denote attachment points to the parent molecule.

In some embodiments of a compound of Formula (II), C-D, R⁵ and R⁶together are selected from the group consisting of:

wherein the wavy lines denote attachment points to the parent molecule.

In some embodiments of a compound of Formula (II), C-D, R⁵ and R⁶together are selected from the group consisting of:

wherein the wavy lines denote attachment points to the parent molecule.

It is understood that each description of C-D may be combined with eachdescription of X, Y, R², R³, R⁴, R⁵, R⁶, 1, m, n, p, and q the same asif each and every combination were specifically and individually listed.

Also provided are salts of compounds referred to herein, such aspharmaceutically acceptable salts. The invention also includes any orall of the stereochemical forms, including any enantiomeric ordiastereomeric forms, and any tautomers or other forms of the compoundsdescribed. It is understood that individual enantiomers anddiastereomers are provided herein and their corresponding structures canbe readily determined.

A compound as detailed herein may in one aspect be in a purified formand compositions comprising a compound in purified forms are detailedherein. Compositions comprising a compound as detailed herein or a saltthereof are provided, such as compositions of substantially purecompounds. In some embodiments, a composition containing a compound asdetailed herein or a salt thereof is in substantially pure form. Unlessotherwise stated, “substantially pure” intends a composition thatcontains no more than 35% impurity, wherein the impurity denotes acompound other than the compound comprising the majority of thecomposition or a salt thereof. In some embodiments, a composition ofsubstantially pure compound or a salt thereof is provided wherein thecomposition contains no more than 25%, 20%, 15%, 10%, or 5% impurity. Insome embodiments, a composition of substantially pure compound or a saltthereof is provided wherein the composition contains or no more than 3%,2%, 1% or 0.5% impurity.

Representative compounds are listed in Table 1.

TABLE 1 Compound No. Structure 1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

414

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

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200

201

202

203

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205

206

207

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209

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211

212

213

214

215

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220

221

222

223

224

225

226

227

228

229

230

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233

234

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242

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263

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265

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267

268

269

270

271

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273

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285

286

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299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

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333

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343

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349

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386

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389

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391

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398

399

400

401

402

403

404

405

406

407

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409

410

411

412

413

414

415

416

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419

420

421

422

423

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425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

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495

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500

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509

510

511

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519

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521

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531

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533

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541

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566

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569

570

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579

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583

584

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611

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619

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623

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631

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800

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806

807

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809

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811

812

813

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815

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819

820

821

822

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825

826

827

828

829

830

831

832

833

834

835

836

837

838

839

840

841

842

843

844

845

846

847

848

In some embodiments, provided herein are compounds described in Table 1,or a tautomer thereof, or a salt of any of the foregoing, and usesthereof.

The embodiments and variations described herein are suitable forcompounds of any formulae detailed herein, where applicable.

Representative examples of compounds detailed herein, includingintermediates and final compounds according to the present disclosureare depicted herein. It is understood that in one aspect, any of thecompounds may be used in the methods detailed herein, including, whereapplicable, intermediate compounds that may be isolated and administeredto an individual.

The compounds depicted herein may be present as salts even if salts arenot depicted and it is understood that the present disclosure embracesall salts and solvates of the compounds depicted here, as well as thenon-salt and non-solvate form of the compound, as is well understood bythe skilled artisan. In some embodiments, the salts of the compoundsprovided herein are pharmaceutically acceptable salts. Where one or moretertiary amine moiety is present in the compound, the N-oxides are alsoprovided and described.

Where tautomeric forms may be present for any of the compounds describedherein, each and every tautomeric form is intended even though only oneor some of the tautomeric forms may be explicitly depicted. Thetautomeric forms specifically depicted may or may not be the predominantforms in solution or when used according to the methods describedherein.

The present disclosure also includes any or all of the stereochemicalforms, including any enantiomeric or diastereomeric forms of thecompounds described. The structure or name is intended to embrace allpossible stereoisomers of a compound depicted. All forms of thecompounds are also embraced by the invention, such as crystalline ornon-crystalline forms of the compounds. Compositions comprising acompound of the invention are also intended, such as a composition ofsubstantially pure compound, including a specific stereochemical formthereof, or a composition comprising mixtures of compounds of theinvention in any ratio, including two or more stereochemical forms, suchas in a racemic or non-racemic mixture.

The invention also intends isotopically-labeled and/orisotopically-enriched forms of compounds described herein. The compoundsherein may contain unnatural proportions of atomic isotopes at one ormore of the atoms that constitute such compounds. In some embodiments,the compound is isotopically-labeled, such as an isotopically-labeledcompound of the formula (I) or variations thereof described herein,where a fraction of one or more atoms are replaced by an isotope of thesame element. Exemplary isotopes that can be incorporated into compoundsof the invention include isotopes of hydrogen, carbon, nitrogen, oxygen,phosphorus, sulfur, chlorine, such as ²H, ³H, ¹¹C, ¹³C, ¹⁴C, ¹³N, ¹⁵O,¹⁷O, ³²P, ³⁵S, ¹⁸F, ³⁶Cl. labeled compounds (e.g. ³H and ¹⁴C) are usefulin compound or substrate tissue distribution studies. Incorporation ofheavier isotopes such as deuterium (²H) can afford certain therapeuticadvantages resulting from greater metabolic stability, for example,increased in vivo half-life, or reduced dosage requirements and, hencemay be preferred in some instances.

Isotopically-labeled compounds of the present invention can generally beprepared by standard methods and techniques known to those skilled inthe art or by procedures similar to those described in the accompanyingExamples substituting appropriate isotopically-labeled reagents in placeof the corresponding non-labeled reagent.

The invention also includes any or all metabolites of any of thecompounds described. The metabolites may include any chemical speciesgenerated by a biotransformation of any of the compounds described, suchas intermediates and products of metabolism of the compound, such aswould be generated in vivo following administration to a human.

Articles of manufacture comprising a compound described herein, or asalt or solvate thereof, in a suitable container are provided. Thecontainer may be a vial, jar, ampoule, preloaded syringe, i.v. bag, andthe like.

Preferably, the compounds detailed herein are orally bioavailable.However, the compounds may also be formulated for parenteral (e.g,intravenous) administration.

One or several compounds described herein can be used in the preparationof a medicament by combining the compound or compounds as an activeingredient with a pharmacologically acceptable carrier, which are knownin the art. Depending on the therapeutic form of the medication, thecarrier may be in various forms. In one variation, the manufacture of amedicament is for use in any of the methods disclosed herein, e.g, forthe treatment of cancer.

General Synthetic Methods

The compounds of the invention may be prepared by a number of processesas generally described below and more specifically in the Exampleshereinafter (such as the schemes provided in the Examples below). In thefollowing process descriptions, the symbols when used in the formulaedepicted are to be understood to represent those groups described abovein relation to the formulae herein.

Where it is desired to obtain a particular enantiomer of a compound,this may be accomplished from a corresponding mixture of enantiomersusing any suitable conventional procedure for separating or resolvingenantiomers. Thus, for example, diastereomeric derivatives may beproduced by reaction of a mixture of enantiomers, e.g, a racemate, andan appropriate chiral compound. The diastereomers may then be separatedby any convenient means, for example by crystallization and the desiredenantiomer recovered. In another resolution process, a racemate may beseparated using chiral High Performance Liquid Chromatography.Alternatively, if desired a particular enantiomer may be obtained byusing an appropriate chiral intermediate in one of the processesdescribed.

Chromatography, recrystallization and other conventional separationprocedures may also be used with intermediates or final products whereit is desired to obtain a particular isomer of a compound or tootherwise purify a product of a reaction.

Solvates and/or polymorphs of a compound provided herein or a saltthereof are also contemplated. Solvates contain either stoichiometric ornon-stoichiometric amounts of a solvent, and are often formed during theprocess of crystallization. Hydrates are formed when the solvent iswater, or alcoholates are formed when the solvent is alcohol. Polymorphsinclude the different crystal packing arrangements of the same elementalcomposition of a compound. Polymorphs usually have different X-raydiffraction patterns, infrared spectra, melting points, density,hardness, crystal shape, optical and electrical properties, stability,and/or solubility. Various factors such as the recrystallizationsolvent, rate of crystallization, and storage temperature may cause asingle crystal form to dominate

In some embodiments, compounds of the Formula (I) or (II) may besynthesized according to Scheme 1.

wherein A, B, C, D, L, X, Y; R¹, R², R³, R⁴, R⁵, R⁶; 1, m, n, p and qare as described for Formula (J), Formula (I), or Formula (II).

wherein A, B, C, D, L, X, Y; R¹, R⁵, R⁶; p and q are as described forFormula (J), Formula (I), or Formula (II).

wherein A, B, C, D, L, X, Y; R¹, R⁵, R⁶; p and q are as described forFormula (J), Formula (I), or Formula (II).

wherein A, B, C, D, L, X, Y; R¹, R², R⁵, R⁶; p and q are as describedfor Formula (J), Formula (I), or Formula (II).

wherein A, B, C, D, L, X, Y; R¹, R², R⁵, R⁶; p and q are as describedfor Formula (J), Formula (I), or Formula (II).

wherein A, B, C, D, L, X, Y; R¹, R², R⁵, R⁶; p and q are as describedfor Formula (J), Formula (I), or Formula (II).

wherein A, B, C, D, L, X, Y; R¹, R², R⁵, R⁶; p and q are as describedfor Formula (J), Formula (I), or Formula (II). Particular examples areprovided in the Example Section below.

Pharmaceutical Compositions and Formulations

Pharmaceutical compositions of any of the compounds detailed herein areembraced by this disclosure. Thus, the present disclosure includespharmaceutical compositions comprising a compound as detailed herein ora salt thereof and a pharmaceutically acceptable carrier or excipient.In one aspect, the pharmaceutically acceptable salt is an acid additionsalt, such as a salt formed with an inorganic or organic acid.Pharmaceutical compositions may take a form suitable for oral, buccal,parenteral, nasal, topical or rectal administration or a form suitablefor administration by inhalation.

A compound as detailed herein may in one aspect be in a purified formand compositions comprising a compound in purified forms are detailedherein. Compositions comprising a compound as detailed herein or a saltthereof are provided, such as compositions of substantially purecompounds. In some embodiments, a composition containing a compound asdetailed herein or a salt thereof is in substantially pure form.

In one variation, the compounds herein are synthetic compounds preparedfor administration to an individual. In another variation, compositionsare provided containing a compound in substantially pure form. Inanother variation, the present disclosure embraces pharmaceuticalcompositions comprising a compound detailed herein and apharmaceutically acceptable carrier. In another variation, methods ofadministering a compound are provided. The purified forms,pharmaceutical compositions and methods of administering the compoundsare suitable for any compound or form thereof detailed herein.

A compound detailed herein or salt thereof may be formulated for anyavailable delivery route, including an oral, mucosal (e.g, nasal,sublingual, vaginal, buccal or rectal), parenteral (e.g, intramuscular,subcutaneous or intravenous), topical or transdermal delivery form. Acompound or salt thereof may be formulated with suitable carriers toprovide delivery forms that include, but are not limited to, tablets,caplets, capsules (such as hard gelatin capsules or soft elastic gelatincapsules), cachets, troches, lozenges, gums, dispersions, suppositories,ointments, cataplasms (poultices), pastes, powders, dressings, creams,solutions, patches, aerosols (e.g, nasal spray or inhalers), gels,suspensions (e.g, aqueous or non-aqueous liquid suspensions,oil-in-water emulsions or water-in-oil liquid emulsions), solutions andelixirs.

One or several compounds described herein or a salt thereof can be usedin the preparation of a formulation, such as a pharmaceuticalformulation, by combining the compound or compounds, or a salt thereof,as an active ingredient with a pharmaceutically acceptable carrier, suchas those mentioned above. Depending on the therapeutic form of thesystem (e.g, transdermal patch vs. oral tablet), the carrier may be invarious forms. In addition, pharmaceutical formulations may containpreservatives, solubilizers, stabilizers, re-wetting agents, emulgators,sweeteners, dyes, adjusters, and salts for the adjustment of osmoticpressure, buffers, coating agents or antioxidants. Formulationscomprising the compound may also contain other substances which havevaluable therapeutic properties. Pharmaceutical formulations may beprepared by known pharmaceutical methods. Suitable formulations can befound, e.g, in Remington's Pharmaceutical Sciences, Mack PublishingCompany, Philadelphia, PA, 20^(th) ed. (2000), which is incorporatedherein by reference.

Compounds as described herein may be administered to individuals in aform of generally accepted oral compositions, such as tablets, coatedtablets, and gel capsules in a hard or in soft shell, emulsions orsuspensions. Examples of carriers, which may be used for the preparationof such compositions, are lactose, corn starch or its derivatives, talc,stearate or its salts, etc. Acceptable carriers for gel capsules withsoft shell are, for instance, plant oils, wax, fats, semisolid andliquid poly-ols, and so on. In addition, pharmaceutical formulations maycontain preservatives, solubilizers, stabilizers, re-wetting agents,emulgators, sweeteners, dyes, adjusters, and salts for the adjustment ofosmotic pressure, buffers, coating agents or antioxidants.

Any of the compounds described herein can be formulated in a tablet inany dosage form described, for example, a compound as described hereinor a salt thereof can be formulated as a 10 mg tablet.

Compositions comprising a compound provided herein are also described.In one variation, the composition comprises a compound or salt thereofand a pharmaceutically acceptable carrier or excipient. In anothervariation, a composition of substantially pure compound is provided.

Methods of Use

Compounds and compositions detailed herein, such as a pharmaceuticalcomposition containing a compound of any formula provided herein or asalt thereof and a pharmaceutically acceptable carrier or excipient, maybe used in methods of administration and treatment as provided herein.The compounds and compositions may also be used in in vitro methods,such as in vitro methods of administering a compound or composition tocells for screening purposes and/or for conducting quality controlassays. In some embodiments of the methods detailed herein, the methodscomprise administration of a compound detailed herein, or a saltthereof, as a monotherapy.

Provided herein is a method of treating a disease in an individualcomprising administering an effective amount of a compound of Formula(J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23)or any embodiment, variation or aspect thereof (collectively, a compoundof Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23))or the present compounds or the compounds detailed ordescribed herein) or a pharmaceutically acceptable salt thereof, to theindividual. Further provided herein is a method of treating aproliferative disease in an individual, comprising administering aneffective amount of the compound of Formula (J), Formula (I), Formula(II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23), or a pharmaceuticallyacceptable salt thereof, to the individual. Also provided herein is amethod of treating cancer in an individual comprising administering aneffective amount of the compound of Formula (J), Formula (I), Formula(II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23)or a pharmaceuticallyacceptable salt thereof, to the individual. In some embodiments, thecompound is administered to the individual according to a dosage and/ormethod of administration described herein.

In some embodiments, the cancer in the individual has one or moremutations or amplification or overexpression of the genes encodingcyclins or of the genes encoding the CDK or loss of endogenous INK4inhibitors by gene deletion, mutation, or promoter hypermethylation, orother genetic events leading to overactivity of one or more of CDK1,CDK2, CDK4, CDK6 and CDK9. In some embodiments, the cancer in theindividual has one or more mutations or amplification or overexpressionof the genes encoding cyclins or of the genes encoding the CDK or lossof endogenous INK4 inhibitors by gene deletion, mutation, or promoterhypermethylation, or other genetic events leading to overactivity ofCDK4/6 and one or more of CDK1, CDK2, and CDK9.

In some embodiments, there is provided a method of treating a cancer inan individual, comprising (a) selecting the individual for treatmentbased on (i) the presence of phosphorylation of the retinoblastoma (Rb)protein in the cancer, or (ii) presence of mutations or amplification oroverexpression of CDK4 or CDK6 in the cancer, and administering aneffective amount of the compound of Formula (J), Formula (I), Formula(II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23), or a pharmaceuticallyacceptable salt thereof, to the individual. In some embodiments, thecancer is assayed for the expression of phosphorylated Rb. In someembodiments, the cancer is assayed for the expression of CDK4 or CDK6.In some embodiments, the CDK4 or CDK6 gene of the cancer is sequenced todetect the one or more mutations or amplifications. In some embodiments,the CDK4 or CDK6 gene is sequenced by biopsying the cancer andsequencing the CDK4 or CDK6 gene from the biopsied cancer. In someembodiments, the CDK4 or CDK6 gene is sequenced by sequencingcirculating-tumor DNA (ctDNA) from the individual.

In some embodiments, provided herein is a method of using a compound ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23) or any embodiment in the manufacture of a medicament fortreatment of a disease. In some embodiments, provided herein is a methodof using a compound of Formula (J), Formula (I), Formula (II), (I-A),(I-B1) to (I-B12), (I-C1)-(I-C23) or any embodiment in the manufactureof a medicament for treatment of cancer.

In some embodiments, a compound of Formula (J), Formula (I), Formula(II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or a salt thereof is usedto treat an individual having a proliferative disease, such as cancer asdescribed herein. In some embodiments, the individual is at risk ofdeveloping a proliferative disease, such as cancer. In some of theseembodiments, the individual is determined to be at risk of developingcancer based upon one or more risk factors. In some of theseembodiments, the risk factor is a family history and/or gene associatedwith cancer.

The present compounds or salts thereof are believed to be effective fortreating a variety of diseases and disorders. For example, in someembodiments, the present compositions may be used to treat aproliferative disease, such as cancer. In some embodiments the cancer isa solid tumor. In some embodiments the cancer is any of adult andpediatric oncology, myxoid and round cell carcinoma, locally advancedtumors, metastatic cancer, human soft tissue sarcomas, including Ewing'ssarcoma, cancer metastases, including lymphatic metastases, squamouscell carcinoma, particularly of the head and neck, esophageal squamouscell carcinoma, oral carcinoma, blood cell malignancies, includingmultiple myeloma, leukemias, including acute lymphocytic leukemia, acutenonlymphocytic leukemia, chronic lymphocytic leukemia, chronicmyelocytic leukemia, and hairy cell leukemia, effusion lymphomas (bodycavity based lymphomas), thymic lymphoma, cutaneous T cell lymphoma,Hodgkin's lymphoma, non-Hodgkin's lymphoma, cancer of the adrenalcortex, ACTH-producing tumors, lung cancer, including small cellcarcinoma and nonsmall cell cancers, breast cancer, including small cellcarcinoma and ductal carcinoma, gastrointestinal cancers, includingstomach cancer, colon cancer, colorectal cancer, polyps associated withcolorectal neoplasia, pancreatic cancer, liver cancer, urologicalcancers, including bladder cancer, including primary superficial bladdertumors, invasive transitional cell carcinoma of the bladder, andmuscle-invasive bladder cancer, prostate cancer, malignancies of thefemale genital tract, including ovarian carcinoma, primary peritonealepithelial neoplasms, cervical carcinoma, uterine endometrial cancers,vaginal cancer, cancer of the vulva, uterine cancer and solid tumors inthe ovarian follicle, malignancies of the male genital tract, includingtesticular cancer and penile cancer, kidney cancer, including renal cellcarcinoma, brain cancer, including intrinsic brain tumors,neuroblastoma, astrocytic brain tumors, gliomas, metastatic tumor cellinvasion in the central nervous system, bone cancers, including osteomasand osteosarcomas, skin cancers, including melanoma, tumor progressionof human skin keratinocytes, squamous cell cancer, thyroid cancer,retinoblastoma, neuroblastoma, peritoneal effusion, malignant pleuraleffusion, mesothelioma, Wilms's tumors, gall bladder cancer,trophoblastic neoplasms, hemangiopericytoma, and Kaposi's sarcoma.

In some embodiments, the cancer is defined by a molecularcharacteristic. In some embodiments, the cancer is an estrogenreceptor-posistive breast cancer. In some embodiments, the breast canceris triple negative breast cancer. In some embodiments, the cancer is aKRAS-mutant non-small cell lung cancer. In some embodiments, the canceris mantle cell lymphoma defined by a translocation involving CCND1resulting in cyclin D1 overexpression.

In some embodiments, the compounds and compositions described hereincause G₁-S cell cycle arrest in a cell (such as a cancer cell). In someembodiments, the cancer cell is a cancer cell from any of the cancertypes described herein. In some embodiments, arrested cells enter astate of apoptosis. In some embodiments, arrested cells enter a state ofsenescence. In some embodiments, provided herein is a method of causingG₁-S checkpoint arrest in a cell comprising administering an effectiveamount of the compound of Formula (J), Formula (I), Formula (II), (I-A),(I-B1) to (I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable saltthereof, to the cell. In some embodiments, the G₁-S cell cycle arrestoccurs in about 40% or more, about 50% or more, about 60% or more, about70% or more, about 80% or more, about 85% or more, about 90% or more,about 95% or more, about 96% or more, about 97% or more, about 98% ormore, or about 99% or more of cells in a cell population. In someembodiments, the G₁-S cell cycle arrest occurs in up to about 99%, up toabout 98%, up to about 97%, up to about 96%, up to about 95%, up toabout 90%, up to about 85%, or up to about 80% of cells in the cellpopulation.

In some embodiments, provided herein is a method of inducing senescencein a cell comprising administering an effective amount of the compoundof Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23)or a pharmaceutically acceptable salt thereof, to thecell. In some embodiments, senescence is induced in about 40% or more,about 50% or more, about 60% or more, about 70% or more, about 80% ormore, about 85% or more, about 90% or more, about 95% or more, about 96%or more, about 97% or more, about 98% or more, or about 99% or more ofcells in a cell population. In some embodiments, senescence is inducedin up to about 99%, up to about 98%, up to about 97%, up to about 96%,up to about 95%, up to about 90%, up to about 85%, or up to about 80% ofcells in the cell population.

In some embodiments, provided herein is a method of inducing apoptosisin a cell comprising administering an effective amount of the compoundof Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof, to thecell. In some embodiments, apoptosis is induced in about 40% or more,about 50% or more, about 60% or more, about 70% or more, about 80% ormore, about 85% or more, about 90% or more, about 95% or more, about 96%or more, about 97% or more, about 98% or more, or about 99% or more ofcells in a cell population. In some embodiments, apoptosis is induced inup to about 99%, up to about 98%, up to about 97%, up to about 96%, upto about 95%, up to about 90%, up to about 85%, or up to about 80% ofcells in the cell population.

In some embodiments, provided herein is a method of inhibiting CDK4 orCDK6 in a cell comprising administering an effective amount of thecompound of Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable salt thereof,to the cell. In some embodiments, CDK4 or CDK6 is inhibited by about 10%or more, about 20% or more, about 30% or more, about 40% or more, about50% or more, about 60% or more, about 70% or more, about 75% or more,about 80% or more, about 90% or more, about 95% or more, about 96% ormore, about 97% or more, about 98% or more, or about 99% or more. Insome embodiments, CDK4 or CDK6is inhibited up to about 99%, up to about98%, up to about 97%, up to about 96%, up to about 95%, up to about 90%,up to about 85%, up to about 80%, up to about 70%, or up to about 60%.In some embodiments, the activity of CDK4 or CDK6 is measured accordingto a kinase assay.

In some embodiments, provided herein is a method of inhibiting one ormore of CDK1, CDK2, CDK4, CDK6, and CDK9 in a cell comprisingadministering an effective amount of the compound of Formula (J),Formula (I), Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or apharmaceutically acceptable salt thereof, to the cell. In someembodiments, one or more of CDK1, CDK2, CDK4, CDK6, and CDK9 isinhibited by about 10% or more, about 20% or more, about 30% or more,about 40% or more, about 50% or more, about 60% or more, about 70% ormore, about 75% or more, about 80% or more, about 90% or more, about 95%or more, about 96% or more, about 97% or more, about 98% or more, orabout 99% or more. In some embodiments, one or more of CDK1, CDK2, CDK4,CDK6, and CDK9 is inhibited up to about 99%, up to about 98%, up toabout 97%, up to about 96%, up to about 95%, up to about 90%, up toabout 85%, up to about 80%, up to about 70%, or up to about 60%. In someembodiments, the activity of one or more of CDK1, CDK2, CDK4, CDK6, andCDK9 is measured according to a kinase assay.

In some embodiments, provided herein is a method of inhibiting CDK4 orCDK6 comprising contacting CDK4 or CDK6 with an effective amount of thecompound of Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable salt thereof.In some embodiments, the compound of Formula (J), Formula (I), Formula(II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23)or a pharmaceuticallyacceptable salt thereof binds to CDK4 or CDK6 with an IC₅₀ of less than1 μM, less than 900 nM, less than 800 nM, less than 700 nM, less than600 nM, less than 500 nM, less than 400 nM, less than 300 nM, less than200 nM, less than 100 nM, less than 50 nM, less than 10 nM, less than 5nM, less than 1 nM, or less than 0.5 nM. In some embodiments, thecompound of Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)or a pharmaceutically acceptable salt thereofbinds to CDK4 or CDK6 with an IC₅₀ between 0.1 nM and 1 nM, between 1 nMand 5 nM, between 5 nM and 10 nM, between 10 nM and 50 nM, between 50 nMand 100 nM, beween 100 nM and 200 nM, between 200 nM and 300 nM, between300 nM and 400 nM, betwee 400 nM and 500 nM, between 500 nM and 600 nM,between 600 nM and 700 nM, between 700 nM and 800 nM, between 800 nM and900 nM, or between 900 nM and 1 μM. In some embodiments, the IC₅₀ ismeasured according to a kinase assay. In some embodiments, the IC₅₀ ismeasured according to a cell proliferation assay.

In some embodiments, provided herein is a method of inhibiting one ormore of CDK1, CDK2, CDK4, CDK6, and CDK9 comprising contacting one ormore of CDK1, CDK2, CDK4, CDK6, and CDK9 with an effective amount of thecompound of Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable salt thereof.In some embodiments, the compound of Formula (J), Formula (I), Formula(II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or a pharmaceuticallyacceptable salt thereof binds to one or more of CDK1, CDK2, CDK4, CDK6,and CDK9 with an IC₅₀ of less than 1μM, less than 900 nM, less than 800nM, less than 700 nM, less than 600 nM, less than 500 nM, less than 400nM, less than 300 nM, less than 200 nM, less than 100 nM, less than 50nM, less than 10 nM, less than 5 nM, less than 1 nM, or less than 0.5nM. In some embodiments, the compound of Formula (J), Formula (I),Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23)or apharmaceutically acceptable salt thereof binds to one or more of CDK1,CDK2, CDK4, CDK6, and CDK9 with an IC₅₀ between 0.1 nM and 1 nM, between1 nM and 5 nM, between 5 nM and 10 nM, between 10 nM and 50 nM, between50 nM and 100 nM, beween 100 nM and 200 nM, between 200 nM and 300 nM,between 300 nM and 400 nM, betwee 400 nM and 500 nM, between 500 nM and600 nM, between 600 nM and 700 nM, between 700 nM and 800 nM, between800 nM and 900 nM, or between 900 nM and 1 μM. In some embodiments, theIC₅₀ is measured according to a kinase assay. In some embodiments, theIC₅₀ is measured according to a cell proliferation assay.

In some embodiments, provided herein is a method of modulating CDK4/6 inan individual, comprising administering to the individual a compound ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23) or a pharmaceutically acceptable salt thereof, or a saltthereof. In some embodiments, provided herein is a method of modulatingCDK4 and CDK 6 in an individual, comprising administering to theindividual a compound of Formula (J), Formula (I), Formula (II), (I-A),(I-B1) to (I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable saltthereof, or a salt thereof. In some embodiments, provided herein is amethod of modulating CDK4/6 and one or more of CDK1, CDK2, and CDK9 inan individual, comprising administering to the individual a compounddetailed herein, or a salt thereof. In some embodiments, provided hereinis a method of modulating CDK4 and CDK 6 and one or more of CDK1, CDK2,and CDK9 in an individual, comprising administering to the individual acompound detailed herein, or a salt thereof. In some embodiments, thecompound of Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable salt thereofbinds to one or more of CDK4/6 with an IC₅₀ of less than 1 μM, less than900 nM, less than 800 nM, less than 700 nM, less than 600 nM, less than500 nM, less than 400 nM, less than 300 nM, less than 200 nM, less than100 nM, less than 50 nM, less than 10 nM, less than 5 nM, less than 1nM, or less than 0.5 nM. In some embodiments, the compound of Formula(J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23)or a pharmaceutically acceptable salt thereof binds to one or more ofCDK4 and CDK6 with an IC₅₀ of less than 1 μM, less than 900 nM, lessthan 800 nM, less than 700 nM, less than 600 nM, less than 500 nM, lessthan 400 nM, less than 300 nM, less than 200 nM, less than 100 nM, lessthan 50 nM, less than 10 nM, less than 5 nM, less than 1 nM, or lessthan 0.5 nM. In some embodiments, the compound of Formula (J), Formula(I), Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23)or apharmaceutically acceptable salt thereof binds to one or more of CDK1,CDK2, CDK4, CDK6, and CDK9 with an IC₅₀ between 0.1 nM and 1 nM, between1 nM and 5 nM, between 5 nM and 10 nM, between 10 nM and 50 nM, between50 nM and 100 nM, beween 100 nM and 200 nM, between 200 nM and 300 nM,between 300 nM and 400 nM, betwee 400 nM and 500 nM, between 500 nM and600 nM, between 600 nM and 700 nM, between 700 nM and 800 nM, between800 nM and 900 nM, or between 900 nM and 1 μM. In some embodiments, theIC₅₀ is measured according to a kinase assay. In some embodiments, theIC₅₀ is measured according to a cell proliferation assay.

In one embodiment, the compound or a salt thereof may enhance theantitumour immunity by increasing the functional capacity of tumourcells to present antigen or by reducing the immunosuppressive T_(Reg)population by suppressing their proliferation.

In some embodiments, provided herein is a method of inhibiting theproliferation of a cell, comprising contacting the cell with aneffective amount of the compound of Formula (J), Formula (I), Formula(II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or a pharmaceuticallyacceptable salt thereof. In some embodiments, the compound of Formula(J), Formula (I), Formula (II), (IA-) , (I-B1) to (I-B12),(I-C1)-(I-C23) or a pharmaceutically acceptable salt thereof iseffective in inhibiting the proliferation of the cell with an EC₅₀ ofless than 5 μM, less than 2 μM, less than 1 μM, less than 900 nM, lessthan 800 nM, less than 700 nM, less than 600 nM, less than 500 nM, lessthan 400 nM, less than 300 nM, less than 200 nM, less than 100 nM, orless than 50 nM. In some embodiments, the compound of Formula (J),Formula (I), Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or apharmaceutically acceptable salt is effective in inhibiting theproliferation of the cell with an EC₅₀ between 10 nM and 20 nM, between20 nM and 50 nM, between 50 nM and 100 nM, between 100 nM and 500 nM,between 500 nM and 1 μM, beween 1 μM and 2 μM, or between 2 μM and 5 μM.In some embodiments, the EC₅₀ is measured according to a cellproliferation assay.

Combination Therapy

As provided herein, the presently disclosed compounds or a salt thereofmay affect the immune system. Accordingly, the present compounds or asalt thereof may be used in combination with other anti-cancer agents orimmunotherapies. In some embodiments, provided herein is a method oftreating a disease in an individual comprising administering aneffective amount of a compound of Formula (J), Formula (I), Formula(II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23), or any embodiment,variation or aspect thereof (collectively, a compound of Formula (J),Formula (I), Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) orthe present compounds or the compounds detailed or described herein) ora pharmaceutically acceptable salt thereof, and an additionaltherapeutic agent to the individual. In some embodiments, the secondtherapeutic agent is a cancer immunotherapy agent or an endocrinetherapy agent or a chemotherapeutic agent. In some embodiments, thedisease is a proliferative disease such as cancer.

In some embodiments, the additional therapeutic agent is a cancerimmunotherapy agent. In some embodiments, the additional therapeuticagent is an immunostimulatory agent. In some embodiments, the additionaltherapeutic agent targets a checkpoint protein (for example an immunecheckpoint inhibitor). In some embodiments, the additional therapeuticagent is effective to stimulate, enhance or improve an immune responseagainst a tumor.

In another aspect provided herein is a combination therapy for thetreatment of a disease, such as cancer. In some embodiments, there isprovide a method of treating a disease in an individual comprisingadministering an effective amount of Formula (J), Formula (I), Formula(II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23), or any embodiment,variation or aspect thereof (collectively, a compound of Formula (J),Formula (I), Formula (II), (IA-) , (I-B1) to (I-B12), (I-C1)-(I-C23), orthe present compounds or the compounds detailed or described herein) ora pharmaceutically acceptable salt thereof, in combination with aradiation therapy.

In some embodiments, there is provide a method of treating a disease inan individual comprising (a) administering an effective amount ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23)or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of an endocrine therapy agent.In some embodiments, the endocrine therapy is antiestrogen therapy. Insome embodiments, the endocrine therapy is a selective estrogen receptordegrader (SERD, such as fulvestrant). In some embodiments, the endocrinetherapy is an aromatase inhibitor (such as letrozole). In someembodiments, the combination of a CDK4/6 inhibitor and endocrine therapycauses enhancement of G1-S cell-cycle arrest. In some embodiments, thecombination of a CDK4/6 inhibitor and endocrine therapy causes enhancedentry into a senescent state. In some embodiments, Formula (J), Formula(I), Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or apharmaceutically acceptable salt thereof is administered prior to,after, or simultaneously co-administered with the endocrine therapyagent. In some embodiments, Formula (J), Formula (I), Formula (II),(I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or a pharmaceuticallyacceptable salt thereof is administered 1 or more hours (such as 2 ormore hours, 4 or more hours, 8 or more hours, 12 or more hours, 24 ormore hours, or 48 or more hours) prior to or after the endocrine therapyagent.

In some embodiments, there is provide a method of treating a disease inan individual comprising (a) administering an effective amount ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (IA-) , (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of a second chemotherapeuticagent. In some embodiments, the chemotherapeutic agent is another kinaseinhibitor. In some embodiments, Formula (J), Formula (I), Formula (II),(I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or a pharmaceuticallyacceptable salt thereof is administered prior to, after, orsimultaneously co-administered with the second chemotherapeutic agent.In some embodiments, Formula (J), Formula (I), Formula (II), (I-A),(I-B1) to (I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable saltthereof is administered 1 or more hours (such as 2 or more hours, 4 ormore hours, 8 or more hours, 12 or more hours, 24 or more hours, or 48or more hours) prior to or after the second chemotherapeutic agent.

Examples of chemotherapeutic agents that can be used in combination withFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23) or a pharmaceutically acceptable salt thereof includeDNA-targeted agents, a DNA alkylating agent (such as cyclophosphamide,mechlorethamine, chlorambucil, melphalan, dacarbazine, or nitrosoureas),a topoisomerase inhibitor (such as a Topoisomerase I inhibitor (e.g,irinotecan or topotecan) or a Topoisomerase II inhibitor (e.g, etoposideor teniposide)), an anthracycline (such as daunorubicin, doxorubicin,epirubicin, idarubicin, mitoxantrone, or valrubicin), a histonedeacetylase inhibitor (such as vorinostat or romidepsin), a bromodomaininhibitor, other epigenetic inhibitors, a taxane (such as paclitaxel ordocetaxel), a kinase inhibitor (such as bortezomib, erlotinib,gefitinib, imatinib, vemurafenib, vismodegib, ibrutinib), ananti-angiogenic inhibitor, a nucleotide analog or precursor analog (suchas azacitidine, azathioprine, capecitabine, cytarabine, doxifluridine,5-fluorouracil, gemcitabine, hydroxyurea, mercaptopurine, methotrexate,or tioguanine), or a platinum-based chemotherapeutic agent (such ascisplatin, carboplatin, or oxaliplatin), pemetrexed, or a combinationthereof. In some embodiments, there is provide a method of treating adisease in an individual comprising (a) administering an effectiveamount of Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23), or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of a kinase inhibitor (such asbortezomib, erlotinib, gefitinib, imatinib, vemurafenib, vismodegib, oribrutinib). In some embodiments, Formula (J), Formula (I), Formula (II),(I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or a pharmaceuticallyacceptable salt thereof is administered prior to, after, orsimultaneously co-administered with the kinase inhibitor. In someembodiments, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable salt thereof isadministered 1 or more hours (such as 2 or more hours, 4 or more hours,8 or more hours, 12 or more hours, 24 or more hours, or 48 or morehours) prior to or after the kinase inhibitor.

In some embodiments, there is provide a method of treating a disease inan individual comprising (a) administering an effective amount ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of a DNA damaging agent. Insome embodiments, Formula (J), Formula (I), Formula (II), (I-A), (I-B1)to (I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable salt thereofis administered prior to, after, or simultaneously co-administered withthe DNA damaging agent. In some embodiments, Formula (J), Formula (I),Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or apharmaceutically acceptable salt thereof is administered 1 or more hours(such as 2 or more hours, 4 or more hours, 8 or more hours, 12 or morehours, 24 or more hours, or 48 or more hours) prior to or after the DNAdamaging agent.

In some embodiments, there is provide a method of treating a disease inan individual comprising (a) administering an effective amount ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23)), or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of a DNA alkylating agent(such as cyclophosphamide, mechlorethamine, chlorambucil, melphalan,dacarbazine, or nitrosoureas). In some embodiments, Formula (J), Formula(I), Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or apharmaceutically acceptable salt thereof is administered prior to,after, or simultaneously co-administered with the DNA alkylating agent.In some embodiments, Formula (J), Formula (I), Formula (II), (I-A),(I-B1) to (I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable saltthereof is administered 1 or more hours (such as 2 or more hours, 4 ormore hours, 8 or more hours, 12 or more hours, 24 or more hours, or 48or more hours) prior to or after the DNA alkylating agent.

In some embodiments, there is provide a method of treating a disease inan individual comprising (a) administering an effective amount ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of a topoisomerase inhibitor(such as a Topoisomerase I inhibitor (e.g, irinotecan or topotecan) or aTopoisomerase II inhibitor (e.g, etoposide or teniposide)). In someembodiments, Formula (J), Formula (I), Formula (II), (I-A) , (I-B1) to(I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable salt thereof isadministered prior to, after, or simultaneously co-administered with thetopoisomerase inhibitor. In some embodiments, Formula (J), Formula (I),Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or apharmaceutically acceptable salt thereof is administered 1 or more hours(such as 2 or more hours, 4 or more hours, 8 or more hours, 12 or morehours, 24 or more hours, or 48 or more hours) prior to or after thetopoisomerase inhibitor.

In some embodiments, there is provide a method of treating a disease inan individual comprising (a) administering an effective amount ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of an anthracycline (such asdaunorubicin, doxorubicin, epirubicin, idarubicin, mitoxantrone, orvalrubicin). In some embodiments, Formula (J), Formula (I), Formula(II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or a pharmaceuticallyacceptable salt thereof is administered prior to, after, orsimultaneously co-administered with the anthracycline. In someembodiments, Formula (J), Formula (I), Formula (II), (IA-) , (I-B1) to(I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable salt thereof isadministered 1 or more hours (such as 2 or more hours, 4 or more hours,8 or more hours, 12 or more hours, 24 or more hours, or 48 or morehours) prior to or after the anthracycline.

In some embodiments, there is provide a method of treating a disease inan individual comprising (a) administering an effective amount ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of a histone deacetylaseinhibitor (such as vorinostat or romidepsin). In some embodiments,Formula I or a pharmaceutically acceptable salt thereof is administeredprior to, after, or simultaneously co-administered with the histonedeacetylase inhibitor. In some embodiments, Formula (J), Formula (I),Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or apharmaceutically acceptable salt thereof is administered 1 or more hours(such as 2 or more hours, 4 or more hours, 8 or more hours, 12 or morehours, 24 or more hours, or 48 or more hours) prior to or after thehistone deacetylase inhibitor.

In some embodiments, there is provide a method of treating a disease inan individual comprising (a) administering an effective amount ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of a taxane (such aspaclitaxel or docetaxel). In some embodiments, Formula (J), Formula (I),Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or apharmaceutically acceptable salt thereof is administered prior to,after, or simultaneously co-administered with the taxane. In someembodiments, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable salt thereof isadministered 1 or more hours (such as 2 or more hours, 4 or more hours,8 or more hours, 12 or more hours, 24 or more hours, or 48 or morehours) prior to or after the taxane.

In some embodiments, there is provide a method of treating a disease inan individual comprising (a) administering an effective amount ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of a nucleotide analog orprecursor analog (such as azacitidine, azathioprine, capecitabine,cytarabine, doxifluridine, 5-fluorouracil, gemcitabine, hydroxyurea,mercaptopurine, methotrexate, or tioguanine). In some embodiments,Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23) or a pharmaceutically acceptable salt thereof isadministered prior to, after, or simultaneously co-administered with thenucleotide analog or precursor analog. In some embodiments, Formula (J),Formula (I), Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or apharmaceutically acceptable salt thereof is administered 1 or more hours(such as 2 or more hours, 4 or more hours, 8 or more hours, 12 or morehours, 24 or more hours, or 48 or more hours) prior to or after thenucleotide analog or precursor analog.

In some embodiments, there is provide a method of treating a disease inan individual comprising (a) administering an effective amount ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of a platinum-basedchemotherapeutic agent (such as cisplatin, carboplatin, or oxaliplatin).In some embodiments, Formula (J), Formula (I), Formula (II), (I-A),(I-B1) to (I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable saltthereof is administered prior to, after, or simultaneouslyco-administered with the platinum-based chemotherapeutic agent. In someembodiments, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable salt thereof isadministered 1 or more hours (such as 2 or more hours, 4 or more hours,8 or more hours, 12 or more hours, 24 or more hours, or 48 or morehours) prior to or after the platinum-based chemotherapeutic agent.

In some embodiments, there is provide a method of treating a disease inan individual comprising (a) administering an effective amount ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of pemetrexed. In someembodiments, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable salt thereof isadministered prior to, after, or simultaneously co-administered with thepemetrexed. In some embodiments, Formula (J), Formula (I), Formula (II),(I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or a pharmaceuticallyacceptable salt thereof is administered 1 or more hours (such as 2 ormore hours, 4 or more hours, 8 or more hours, 12 or more hours, 24 ormore hours, or 48 or more hours) prior to or after the pemetrexed.

In some embodiments, there is provide a method of treating a disease inan individual comprising (a) administering an effective amount ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of a Bruton's tyrosine kinase(BTK) inhibitor. In some embodiments, Formula (J), Formula (I), Formula(II), (IA-), (I-B1) to (I-B12), (I-C1)-(I-C23) or a pharmaceuticallyacceptable salt thereof is administered prior to, after, orsimultaneously co-administered with the BTK inhibitor. In someembodiments, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable salt thereof isadministered 1 or more hours (such as 2 or more hours, 4 or more hours,8 or more hours, 12 or more hours, 24 or more hours, or 48 or morehours) prior to or after the BTK inhibitor.

In some embodiments, there is provide a method of treating a disease inan individual comprising (a) administering an effective amount ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of a PI3K or Akt inhibitor. Insome embodiments, Formula (J), Formula (I), Formula (II), (I-A), (I-B1)to (I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable salt thereofis administered prior to, after, or simultaneously co-administered withthe PI3K or Akt inhibitor. In some embodiments, Formula (J), Formula(I), Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or apharmaceutically acceptable salt thereof is administered 1 or more hours(such as 2 or more hours, 4 or more hours, 8 or more hours, 12 or morehours, 24 or more hours, or 48 or more hours) prior to or after the PI3Kor Akt inhibitor.

In some embodiments, there is provide a method of treating a disease inan individual comprising (a) administering an effective amount ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23)), or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of a DNA damage repair (DDR)pathway inhibitor. In some embodiments, Formula (J), Formula (I),Formula (II), (IA-) , (I-B1) to (I-B12), (I-C1)-(I-C23)or apharmaceutically acceptable salt thereof is administered prior to,after, or simultaneously co-administered with the DDR pathway inhibitor.In some embodiments, Formula (J), Formula (I), Formula (II), (IA-) ,(I-B1) to (I-B12), (I-C1)-(I-C23)or a pharmaceutically acceptable saltthereof is administered 1 or more hours (such as 2 or more hours, 4 ormore hours, 8 or more hours, 12 or more hours, 24 or more hours, or 48or more hours) prior to or after the DDR pathway inhibitor. Examples ofinhibitors of the DDR pathway include poly(ADP-ribose) polymerase (PARP)inhibitors (such as olaparib, rucaparib, niraparib, or talazoparib),ataxia telangiectasia mutated (ATM) protein inhibitors, ataxiatelangiectasia and Rad3-related (ATR) protein inhibitors, checkpointkinase 1 (Chk1) inhibitors, or combinations thereof.

In some embodiments, there is provide a method of treating a disease inan individual comprising (a) administering an effective amount ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of a PARP inhibitor (such asolaparib, rucaparib, niraparib, or talazoparib). In some embodiments,Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23) or a pharmaceutically acceptable salt thereof isadministered prior to, after, or simultaneously co-administered with thePARP inhibitor. In some embodiments, Formula (J), Formula (I), Formula(II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or a pharmaceuticallyacceptable salt thereof is administered 1 or more hours (such as 2 ormore hours, 4 or more hours, 8 or more hours, 12 or more hours, 24 ormore hours, or 48 or more hours) prior to or after the PARP inhibitor.

In some embodiments, there is provide a method of treating a disease inan individual comprising (a) administering an effective amount ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23)), or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of an ATM protein inhibitor.In some embodiments, Formula (J), Formula (I), Formula (II), (I-A),(I-B1) to (I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable saltthereof is administered prior to, after, or simultaneouslyco-administered with the ATM protein inhibitor. In some embodiments,Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23) or a pharmaceutically acceptable salt thereof isadministered 1 or more hours (such as 2 or more hours, 4 or more hours,8 or more hours, 12 or more hours, 24 or more hours, or 48 or morehours) prior to or after the ATM protein inhibitor.

In some embodiments, there is provide a method of treating a disease inan individual comprising (a) administering an effective amount ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of an ATR protein inhibitor.In some embodiments, Formula (J), Formula (I), Formula (II), (I-A),(I-B1) to (I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable saltthereof is administered prior to, after, or simultaneouslyco-administered with the ATR protein inhibitor. In some embodiments,Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23) or a pharmaceutically acceptable salt thereof isadministered 1 or more hours (such as 2 or more hours, 4 or more hours,8 or more hours, 12 or more hours, 24 or more hours, or 48 or morehours) prior to or after the ATR protein inhibitor.

In some embodiments, there is provide a method of treating a disease inan individual comprising (a) administering an effective amount ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of an Chk1 inhibitor. In someembodiments, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable salt thereof isadministered prior to, after, or simultaneously co-administered with theChk1 inhibitor. In some embodiments, Formula (J), Formula (I), Formula(II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or a pharmaceuticallyacceptable salt thereof is administered 1 or more hours (such as 2 ormore hours, 4 or more hours, 8 or more hours, 12 or more hours, 24 ormore hours, or 48 or more hours) prior to or after the Chk1 inhibitor.

In some embodiments, there is provide a method of treating a disease inan individual comprising (a) administering an effective amount ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23)), or any embodiment, variation or aspect thereof(collectively, Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23)) or a pharmaceutically acceptable salt thereof,and (b) administering an effective amount of a further CDK4/6 inhibitor.In some embodiments, Formula (J), Formula (I), Formula (II), (I-A),(I-B1) to (I-B12), (I-C1)-(I-C23) or a pharmaceutically acceptable saltthereof is administered prior to, after, or simultaneouslyco-administered with the further CDK4/6 inhibitor. In some embodiments,Formula (J), Formula (I), Formula (II), (IA-) , (I-B1) to (I-B12),(I-C1)-(I-C23) or a pharmaceutically acceptable salt thereof isadministered 1 or more hours (such as 2 or more hours, 4 or more hours,8 or more hours, 12 or more hours, 24 or more hours, or 48 or morehours) prior to or after the further CDK4/6 inhibitor.

In another aspect, provided herein is a combination therapy in which acompound of Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23), or a salt thereof is coadministered (which maybe separately or simultaneously) with one or more additional agents thatare effective in stimulating immune responses to thereby furtherenhance, stimulate or upregulate immune responses in a subject. Forexample, provided is a method for stimulating an immune response in asubject comprising administering to the subject a compound of Formula(J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or a salt thereof and one or more immunostimulatoryantibodies, such as an anti-PD-1 antibody, an anti-PD-L1 antibody and/oran anti-CTLA-4 antibody, such that an immune response is stimulated inthe subject, for example to inhibit tumor growth. In one embodiment, thesubject is administered a compound of formula Formula (J), Formula (I),Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or a salt thereofand an anti-PD-1 antibody. In another embodiment, the subject isadministered a compound of Formula (J), Formula (I), Formula (II),(I-A), (I-B1) to (I-B12), (I-C1)-(I-C23), or a salt thereof and ananti-PD-L1 antibody. In yet another embodiment, the subject isadministered a compound of Formula (J), Formula (I), Formula (II),(I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or a salt thereof and ananti-CTLA-4 antibody. In another embodiment, the immunostimulatoryantibody (e.g, anti-PD-1, anti-PD-L1 and/or anti-CTLA-4 antibody) is ahuman antibody. Alternatively, the immunostimulatory antibody can be,for example, a chimeric or humanized antibody (e.g, prepared from amouse anti-PD-1, anti-PD-L1 and/or anti-CTLA-4 antibody).

In one embodiment, the present disclosure provides a method for treatinga proliferative disease (e.g, cancer), comprising administering acompound of Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23), or a salt thereof and an anti-PD-1 antibody toa subject. In further embodiments, a compound of Formula (J), Formula(I), Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or a saltthereof is administered at a subtherapeutic dose, the anti-PD-1 antibodyis administered at a subtherapeutic dose, or both are administered at asubtherapeutic dose. In another embodiment, the present disclosureprovides a method for altering an adverse event associated withtreatment of a hyperproliferative disease with an immunostimulatoryagent, comprising administering a compound of Formula (J), Formula (I),Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23), or a saltthereof and a subtherapeutic dose of anti-PD-1 antibody to a subject. Incertain embodiments, the subject is human. In certain embodiments, theanti-PD-1 antibody is a human sequence monoclonal antibody.

In one embodiment, the present invention provides a method for treatinga hyperproliferative disease (e.g, cancer), comprising administering acompound of Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23), or a salt thereof and an anti-PD-L1 antibody toa subject. In further embodiments, a compound of Formula (J), Formula(I), Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or a saltthereof is administered at a subtherapeutic dose, the anti-PD-L1antibody is administered at a subtherapeutic dose, or both areadministered at a subtherapeutic dose. In another embodiment, thepresent invention provides a method for altering an adverse eventassociated with treatment of a hyperproliferative disease with animmunostimulatory agent, comprising administering a compound of Formula(J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or a salt thereof and a subtherapeutic dose ofanti-PD-Ll antibody to a subject. In certain embodiments, the subject ishuman. In certain embodiments, the anti-PD-L1 antibody is a humansequence monoclonal antibody.

In certain embodiments, the combination of therapeutic agents discussedherein can be administered concurrently as a single composition in apharmaceutically acceptable carrier, or concurrently as separatecompositions each in a pharmaceutically acceptable carrier. In anotherembodiment, the combination of therapeutic agents can be administeredsequentially. For example, an anti-CTLA-4 antibody and a compound ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or a salt thereof can be administered sequentially, suchas anti-CTLA-4 antibody being administered first and a compound ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or a salt thereof second, or a compound of Formula (J),Formula (I), Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23), ora salt thereof being administered first and anti-CTLA-4 antibody second.Additionally or alternatively, an anti-PD-1 antibody and a compound ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or a salt thereof can be administered sequentially, suchas anti-PD-1 antibody being administered first and a compound of Formula(J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or a salt thereof second, or a compound of Formula (J),Formula (I), Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23), ora salt thereof being administered first and anti-PD-1 antibody second.Additionally or alternatively, an anti-PD-L1 antibody and a compound ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or a salt thereof can be administered sequentially, suchas anti-PD-L1 antibody being administered first and a compound ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or a salt thereof second, or a compound of Formula (J),Formula (I), Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23), ora salt thereof being administered first and anti-PD-L1 antibody second.

Furthermore, if more than one dose of the combination therapy isadministered sequentially, the order of the sequential administrationcan be reversed or kept in the same order at each time point ofadministration, sequential administrations can be combined withconcurrent administrations, or any combination thereof.

Optionally, the combination of a compound of Formula (J), Formula (I),Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23), or a saltthereof can be further combined with an immunogenic agent, such ascancerous cells, purified tumor antigens (including recombinantproteins, peptides, and carbohydrate molecules), cells, and cellstransfected with genes encoding immune stimulating cytokines.

A compound of Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23), or a salt thereof can also be further combinedwith standard cancer treatments. For example, a compound of Formula (J),Formula (I), Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23), ora salt thereof can be effectively combined with chemotherapeuticregimens. In these instances, it is possible to reduce the dose of otherchemotherapeutic reagent administered with the combination of theinstant disclosure. Other combination therapies with a compound ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23)), or a salt thereof include radiation, surgery, orhormone deprivation. Angiogenesis inhibitors can also be combined with acompound of Formula (J), Formula (I), Formula (II), (I-A), (I-B1) to(I-B12), (I-C1)-(I-C23), or a salt thereof. Inhibition of angiogenesisleads to tumor cell death, which can be a source of tumor antigen fedinto host antigen presentation pathways.

In another example, a compound of Formula (J), Formula (I), Formula(II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23)), or a salt thereof canbe used in conjunction with anti-neoplastic antibodies. By way ofexample and not wishing to be bound by theory, treatment with ananti-cancer antibody or an anti-cancer antibody conjugated to a toxincan lead to cancer cell death (e.g, tumor cells) which would potentiatean immune response mediated by CTLA-4, PD-1, PD-L1 or a compound ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23), or a salt thereof. In an exemplary embodiment, atreatment of a hyperproliferative disease (e.g, a cancer tumor) caninclude an anti-cancer antibody in combination with a compound ofFormula (J), Formula (I), Formula (II), (I-A), (I-B1) to (I-B12),(I-C1)-(I-C23)or a salt thereof and anti-CTLA-4 and/or anti-PD-1 and/oranti-PD-L1 antibodies, concurrently or sequentially or any combinationthereof, which can potentiate anti-tumor immune responses by the host.Other antibodies that can be used to activate host immune responsivenesscan be further used in combination with a compound of Formula (J),Formula (I), Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23) or asalt thereof.

In some embodiments, a compound of Formula (J), Formula (I), Formula(II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23), or a salt thereof can becombined with an anti-CD73 therapy, such as an anti-CD73 antibody.

In yet further embodiments, the compound of Formula (J), Formula (I),Formula (II), (I-A), (I-B1) to (I-B12), (I-C1)-(I-C23), or a saltthereof is administered in combination with another CDK4 or CDK6inhibitor or other CDK inhibitor.

Dosing and Method of Administration

The dose of a compound administered to an individual (such as a human)may vary with the particular compound or salt thereof, the method ofadministration, and the particular disease, such as type and stage ofcancer, being treated. In some embodiments, the amount of the compoundor salt thereof is a therapeutically effective amount.

The effective amount of the compound may in one aspect be a dose ofbetween about 0.01 and about 100 mg/kg. Effective amounts or doses ofthe compounds of the invention may be ascertained by routine methods,such as modeling, dose escalation, or clinical trials, taking intoaccount routine factors, e.g, the mode or route of administration ordrug delivery, the pharmacokinetics of the agent, the severity andcourse of the disease to be treated, the subject's health status,condition, and weight. An exemplary dose is in the range of about fromabout 0.7 mg to 7 g daily, or about 7 mg to 350 mg daily, or about 350mg to 1.75 g daily, or about 1.75 to 7 g daily.

Any of the methods provided herein may in one aspect compriseadministering to an individual a pharmaceutical composition thatcontains an effective amount of a compound provided herein or a saltthereof and a pharmaceutically acceptable excipient.

A compound or composition of the invention may be administered to anindividual in accordance with an effective dosing regimen for a desiredperiod of time or duration, such as at least about one month, at leastabout 2 months, at least about 3 months, at least about 6 months, or atleast about 12 months or longer, which in some variations may be for theduration of the individual's life. In one variation, the compound isadministered on a daily or intermittent schedule. The compound can beadministered to an individual continuously (for example, at least oncedaily) over a period of time. The dosing frequency can also be less thanonce daily, e.g, about a once weekly dosing. The dosing frequency can bemore than once daily, e.g, twice or three times daily. The dosingfrequency can also be intermittent, including a ‘drug holiday’ (e.g,once daily dosing for 7 days followed by no doses for 7 days, repeatedfor any 14 day time period, such as about 2 months, about 4 months,about 6 months or more). Any of the dosing frequencies can employ any ofthe compounds described herein together with any of the dosagesdescribed herein.

The compounds provided herein or a salt thereof may be administered toan individual via various routes, including, e.g, intravenous,intramuscular, subcutaneous, oral and transdermal. A compound providedherein can be administered frequently at low doses, known as ‘metronomictherapy,’ or as part of a maintenance therapy using compound alone or incombination with one or more additional drugs. Metronomic therapy ormaintenance therapy can comprise administration of a compound providedherein in cycles. Metronomic therapy or maintenance therapy can compriseintra-tumoral administration of a compound provided herein.

In one aspect, the invention provides a method of treating cancer in anindividual by parenterally administering to the individual (e.g, ahuman) an effective amount of a compound or salt thereof. In someembodiments, the route of administration is intravenous, intra-arterial,intramuscular, or subcutaneous. In some embodiments, the route ofadministration is oral. In still other embodiments, the route ofadministration is transdermal.

The invention also provides compositions (including pharmaceuticalcompositions) as described herein for the use in treating, preventing,and/or delaying the onset and/or development of cancer and other methodsdescribed herein. In certain embodiments, the composition comprises apharmaceutical formulation which is present in a unit dosage form.

Also provided are articles of manufacture comprising a compound of thedisclosure or a salt thereof, composition, and unit dosages describedherein in suitable packaging for use in the methods described herein.Suitable packaging is known in the art and includes, for example, vials,vessels, ampules, bottles, jars, flexible packaging and the like. Anarticle of manufacture may further be sterilized and/or sealed.

Kits

The present disclosure further provides kits for carrying out themethods of the invention, which comprises one or more compoundsdescribed herein or a composition comprising a compound describedherein. The kits may employ any of the compounds disclosed herein. Inone variation, the kit employs a compound described herein or a saltthereof. The kits may be used for any one or more of the uses describedherein, and, accordingly, may contain instructions for the treatment ofcancer.

Kits generally comprise suitable packaging. The kits may comprise one ormore containers comprising any compound described herein. Each component(if there is more than one component) can be packaged in separatecontainers or some components can be combined in one container wherecross-reactivity and shelf life permit.

The kits may be in unit dosage forms, bulk packages (e.g, multi-dosepackages) or sub-unit doses. For example, kits may be provided thatcontain sufficient dosages of a compound as disclosed herein and/or asecond pharmaceutically active compound useful for a disease detailedherein to provide effective treatment of an individual for an extendedperiod, such as any of a week, 2 weeks, 3 weeks, 4 weeks, 6 weeks, 8weeks, 3 months, 4 months, 5 months, 7 months, 8 months, 9 months, ormore. Kits may also include multiple unit doses of the compounds andinstructions for use and be packaged in quantities sufficient forstorage and use in pharmacies (e.g, hospital pharmacies and compoundingpharmacies).

The kits may optionally include a set of instructions, generally writteninstructions, although electronic storage media (e.g, magnetic disketteor optical disk) containing instructions are also acceptable, relatingto the use of component(s) of the methods of the present invention. Theinstructions included with the kit generally include information as tothe components and their administration to an individual.

The invention can be further understood by reference to the followingexamples, which are provided by way of illustration and are not meant tobe limiting.

EXAMPLES Synthetic Examples Example-1 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine(Compound 1):

Step-1: Synthesis of6-bromo-8-fluoro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one: To astirred solution of 6-bromo-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one(7000 mg, 28.56 mmol, 1 equiv) in DMF (70 mL), was added NaH (60%) (2282mg, 57.12 mmol, 2 equiv) at 0° C. and stirred for 30 min at RT, followedby the addition of 2-iodopropane (5.6 mL, 57.12 mmol, 2 equiv). Thereaction mixture was heated to 80° C. for 3 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture cooled to RT and quenched with ice-cold water (100 mL)and extracted with EtOAc (150 mL×3). Organic layer was washed with water(150 mL) and brine solution (150 mL). Organic layer was dried overanhydrous Na₂SO₄ and concentrated under reduced pressure to obtain crudecompound, which was purified by normal phase combi-flash to obtain6-bromo-8-fluoro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one (2400 mg,29%) as off white solid compound.

LCMS 288 [M+H]⁺

Step-2: Synthesis of6-bromo-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine: To astirred solution of6-bromo-8-fluoro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one (1400 mg,4.87 mmol, 1 equiv) in THF (14 mL), was added BH₃.DMS (9.7 mL, 7.66mmol, 4 equiv) drop wise at 0° C. The reaction mixture was heated to 80°C. for 16 h. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, the reaction mixture was quenched withsaturated solution of NaHCO₃ (100 mL) and extracted with EtOAc (100mL×3). The combined organic layer was washed with water (100 mL) andbrine solution (100 mL). Organic layer was dried over anhydrous Na₂SO₄and concentrated under reduced pressure to obtain6-bromo-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine (1200mg, 90%) as a yellow viscous compound.

LCMS 274 [M+H]⁺

Step-3: Synthesis of8-fluoro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine:To a stirred solution of6-bromo-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine (1200mg, 4.39 mmol, 1 equiv) in dioxane (12 mL), was added4,4,5,5-tetramethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,2-dioxaborolane(1340 mg, 5.27 mmol, 1.2 equiv) and potassium acetate (1291 mg, 13.17mmol, 3 equiv). Purge the reaction mixture with nitrogen gas for 15 min.After addition of Pd(dppf).DCM (179 mg, 0.219 mmol, 0.5 equiv) againpurge with nitrogen for 5 min. The reaction mixture was heated to 100°C. for 4 h. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, the reaction mixture was diluted withwater (30 mL) and extracted with EtOAc (100 mL×2). Organic layer waswashed with brine (100 mL), dried over anhydrous Na₂SO₄ and concentratedunder reduced pressure to obtain8-fluoro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(1000 mg, 69%) as a dark brown viscous compound.

LCMS 322.1 [M+H]⁺

Step-4: Synthesis of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine: To a stirred solution of2,4-dichloro-5-fluoropyrimidine (500 mg, 3.01 mmol, 1 equiv) and8-fluoro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(970.1 mg, 3.01 mmol, 1 equiv) in THF: Water (1:1, 16 mL) was addedPotassium carbonate (831 mg, 6.02 mmol, 2 equiv) and Pd(PPh₃)₄ (174 mg,0.15 mmol, 0.05 equiv). The reaction mixture was heated to 80° C. for 4h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the reaction mixture was diluted with water(30 mL) and extracted with EtOAc (100 mL×2), organic layer was washedwith water (100 mL) and brine solution (100 mL). The organic layer driedover anhydrous Na₂SO₄ and concentrated under reduced pressure to obtaincrude compound, which was purified by normal phase combi-flash to obtain6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(800 mg, 82%) as a yellow solid compound.

LCMS 326 [M+H]⁺

Step-5: Synthesis of tert-butyl4-(6-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-ylamino)pyridin-3-yl)piperazine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(300 mg, 0.923 mmol, 1 equiv) in Dioxane (10 mL), was added tert-butyl4-(6-aminopyridin-3-yl)piperazine-1-carboxylate (282.3 mg, 1.015 mmol,1.1 equiv) and cesium carbonate (451.4 mg, 1.384 mmol, 1.5 equiv). Thereaction mixture was aerated with nitrogen gas for 30 min, followed bythe addition of palladium acetate (4.2 mg, 0.018 mmol, 0.02 equiv) andBINAP (23 mg, 0.036 mmol, 0.04 equiv) again purged nitrogen for 5 min.The resultant reaction mixture was heated to 100° C. for 16 h. Progressof the reaction was monitored by TLC and LCMS. After completion of thereaction, the reaction mixture was diluted with EtOAc (25 mL). Solidobserved was filtered and washed with EtOAc (20 mL) to obtain tert-butyl4-(6-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-ylamino)pyridin-3-yl)piperazine-1-carboxylate(190 mg, 36%) as a greenish solid compound.

LCMS 568.3 [M+H]⁺

Step-6: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine:Tert-butyl4-(6-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-ylamino)pyridin-3-yl)piperazine-1-carboxylate(190 mg, 0.335 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was stirred at RT for 16 h. Progressof the reaction was monitored by LCMS. After completion of the reaction,the reaction mixture was concentrated under vacuum to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine(180 mg, 100%) as a pale yellow solid compound.

LCMS 468.2 [M+H]⁺

¹HNMR (400 MHz, DMSO-d₆) δ 9.04 (d, J=7.4 Hz, 2H), 8.67 (d, J=3.7 Hz,1H), 8.01 (d, J=2.9 Hz,1H), 7.91 (s, 1H), 7.77 (d, J=9.5 Hz, 1H), 7.42(s, 1H), 7.19 (d, J=11.5 Hz, 1H), 4.36-4.21 (s, 2H), 4.17-4.07 (m, 1H),3.38 (t, J=5.1 Hz, 4H), 3.32 (d, J=4.3 Hz, 2H), 3.26 (s, 4H), 1.19 (d,J=6.5 Hz, 6H).

Example-2 Synthesis of8-fluoro-6-(5-fluoro-2-(5-(piperazin-1-yl)pyridin-2-ylamino)pyrimidin-4-yl)-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one(Compound 2):

Step-1: Synthesis of6-bromo-8-fluoro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one: To astirred solution of 6-bromo-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one(7000 mg, 28.56 mmol, 1 equiv) in DMF (70 mL), was added NaH (60%) (2282mg, 57.12 mmol, 2 equiv) at 0° C. and stirred at RT for 30 min, followedby the addition of 2-iodopropane (5.6 mL, 57.12 mmol, 2 equiv). Thereaction mixture was heated to 80° C. for 3 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (100 mL) and extracted withEtOAc (150 mL×3). Organic layer was washed with water (150 mL), brinesolution (150 mL). Organic layer was dried over anhydrous Na₂SO₄ andconcentrated under reduced pressure to obtain crude compound, which waspurified by normal phase combi-flash to obtain6-bromo-8-fluoro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one (2400 mg,29%) as an off white solid compound.

LCMS 288 [M+H]⁺

Step-2: Synthesis of8-fluoro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2H-benzo[b][1,4]oxazin-3(4H)-one:To a stirred solution of6-bromo-8-fluoro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one (1000 mg,3.48 mmol, 1 equiv) and4,4,5,5-tetramethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,2-dioxaborolane(1062 mg, 4.18 mmol, 1.2 equiv) in Dioxane was added Potassium acetate(1023 mg, 10.44 mmol, 3 equiv). Purge the reaction mixture with nitrogengas for 15 min. After addition of Pd(dppf) DCM (142 mg, 0.174 mmol, 0.05equiv) again purged nitrogen for 5 min. The reaction mixture was stirredat 100° C. for 4 h. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, the reaction mixture was dilutedwith water (30 mL) and extracted with EtOAc (100 mL×2). Organic layerwas washed with brine (100 mL), dried over anhydrous Na₂SO₄ andconcentrated under reduced pressure to obtain8-fluoro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2H-benzo[b][1,4]oxazin-3(4H)-one(950 mg, 76%) as a dark brown viscous compound.

LCMS 336.1 [M+H]⁺

Step-3: Synthesis of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one:To a stirred solution of 2,4-dichloro-5-fluoropyrimidine (450 mg, 2.71mmol, 1 equiv),8-fluoro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2H-benzo[b][1,4]oxazin-3(4H)-one(908.4 mg, 2.71 mmol, 1 equiv), Potassium carbonate (748 mg, 5.42 mmol,2 equiv) in THF: Water (1:1) (16 mL), was added (8:8 mL) Pd(PPh₃)₄ (157mg, 0.135 mmol, 0.05 equiv). The reaction mixture was heated to 80° C.for 4 h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the reaction mixture was diluted with water(30 mL) and extracted with EtOAc (100 mL×2). Organic layer was washedwith water (100 mL) and brine solution (100 mL). Organic layer was driedover anhydrous Na₂SO₄ and concentrated under reduced pressure to obtaincrude compound, which was purified by normal phase combiflash to obtain6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one(270 mg, 29%) as a white solid compound.

LCMS 340 [M+H]⁺

Step-4: Synthesis of tert-butyl4-(6-(5-fluoro-4-(8-fluoro-4-isopropyl-3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-ylamino)pyridin-3-yl)piperazine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one(240 mg, 0.707 mmol, 1 equiv) in Dioxane (10 mL), was added tert-butyl4-(6-aminopyridin-3-yl)piperazine-1-carboxylate (217 mg, 0.778 mmol, 1.1equiv) and cesium carbonate (346 mg, 1.06 mmol, 1.5 equiv). The reactionmixture was aerated with nitrogen gas for 30 min, followed by theaddition of palladium acetate (3.2 mg, 0.014 mmol, 0.02 equiv) and BINAP(17.6 mg, 0.028 mmol, 0.04 equiv) again purged nitrogen for 5 min. Theresultant reaction mixture was heated to 100° C. for 16 h. Progress ofthe reaction was monitored by TLC and LCMS. After completion of thereaction, the reaction mixture was diluted with EtOAc (25 mL). Solidobserved was filtered and washed with EtOAc(20 mL) to obtain tert-butyl4-(6-(5-fluoro-4-(8-fluoro-4-isopropyl-3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-ylamino)pyridin-3-yl)piperazine-1-carboxylate(125 mg, 30%) yellow solid compound.

LCMS 582.3 [M+H]⁺

Step-5: Synthesis of8-fluoro-6-(5-fluoro-2-(5-(piperazin-1-yl)pyridin-2-ylamino)pyrimidin-4-yl)-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one:Tert-butyl4-(6-(5-fluoro-4-(8-fluoro-4-isopropyl-3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-ylamino)pyridin-3-yl)piperazine-1-carboxylate(125 mg, 0.215 mmol, 1 equiv) was taken in 1.25M HCl in ethanol (5 mL)and the resultant reaction mixture was stirred at RT for 16 h. Progressof the reaction was monitored by LCMS. After completion of the reaction,the reaction mixture was concentrated under vacuum to obtain8-fluoro-6-(5-fluoro-2-(5-(piperazin-1-yl) pyridin-2-ylamino)pyrimidin-4-yl)-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one (120 mg,100%) as a yellow solid compound.

LCMS 482.2 [M+H]⁺

¹HNMR (400 MHz, DMSO-d₆) δ 8.97 (s, 2H), 8.72 (d, J=3.5 Hz, 1H), 8.04(d, J=3.0 Hz, 1H), 7.96 (d, J=9.1 Hz, 1H), 7.84 (s, 1H), 7.66 (d, J=10.8Hz, 2H), 4.83-4.81 (M, 1H), 4.78-4.76 (s, 2H), 3.36 (t, J=5.0 Hz, 4H),3.26 (q, J=4.4 Hz, 4H), 1.51 (d, J=7.0 Hz, 6H).

Example-3 Synthesis of5-fluoro-4-(8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5(piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine (Compound 3):

Step-1: Synthesis of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine:To a stirred solution of 2,4-dichloro-5-fluoropyrimidine (4000 mg, 24.09mmol, 1 equiv),8-fluoro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(6722 mg, 24.09 mmol, 1 equiv), Potassium carbonate (6649 mg, 48.18mmol, 2 equiv), Pd(PPh3)4 (1391 mg, 1.2 mmol, 0.05 equiv) in THF: Water(1:1,40 mL) were charged. The reaction mixture was heated to 80° C. for16 h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the reaction mixture was diluted with water(100 mL) and extracted with EtOAc (150 mL×3). Organic layer was washedwith water (150 mL), brine solution (150 mL). Organic layer was driedover anhydrous Na₂SO₄ and concentrated under reduced pressure to obtaincrude compound, which was purified by normal phase combi-flash to obtain6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine(3400 mg, 50%) as a brown color solid compound.

LCMS 284 [M+H]⁺

Step-2: Synthesis of tert-butyl4-(6-(5-fluoro-4-(8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-ylamino)pyridin-3-yl)piperazine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine(200 mg, 0.706 mmol, 1 equiv) in Methyl isobutyl ketone (6 mL), wasadded tert-butyl 4-(6-aminopyridin-3-yl)piperazine-1-carboxylate (216mg, 0.776 mmol, 1.1 equiv) and cesium carbonate (345 mg, 1.059 mmol, 1.5equiv). The reaction mixture was aerated with nitrogen gas for 30 min,followed by the addition of palladium acetate (3.1 mg, 0.014 mmol, 0.02equiv) and BINAP (18 mg, 0.028 mmol, 0.04 equiv) again purged nitrogenfor 5 min. The resultant reaction mixture was heated to 100° C. for 16h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the reaction mixture was diluted with water(25 mL) and extracted with EtOAc (50 mL×3). Organic layer was washedwith water (50 mL) and brine solution (50 mL). Organic layer was driedover anhydrous Na₂SO₄ and concentrated under reduced pressure to obtaincrude compound, which was purified with reverse phase HPLC to obtaintert-butyl4-(6-(5-fluoro-4-(8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-ylamino)pyridin-3-yl)piperazine-1-carboxylate(90 mg, 25%) as a yellow solid compound.

LCMS 526 [M+H]⁺

Step-3: Synthesis of5-fluoro-4-(8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine:Tert-butyl4-(6-(5-fluoro-4-(8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-ylamino)pyridin-3-yl)piperazine-1-carboxylate(90 mg, 0.133 mmol, 1 equiv) was taken in 1.25M HCl in ethanol (5 mL)and the resultant reaction mixture was stirred at RT for 16 h. Progressof the reaction was monitored by LCMS. After completion of the reaction,the reaction mixture was concentrated under vacuum to obtain5-fluoro-4-(8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine(70 mg, 97%) as a pale yellow solid compound.

LCMS 426 [M+H]⁺

¹HNMR (400 MHz, Methanol-d₄) δ 8.65 (d, J=3.9 Hz, 1H), 8.25 (dd, J=9.7,2.6 Hz, 1H), 7.89 (d, J=2.7 Hz, 1H), 7.51 (d, J=9.6 Hz, 1H), 7.33 (d,J=11.3 Hz, 2H), 4.33 (t, J=4.3 Hz, 2H), 3.56-3.49 (m, 4H), 3.48-3.41 (m,4H), 1.29 (t, J=3.2 Hz, 2H).

Example-4 Synthesis of N-(5((4-ethylpiperazin-1-yl) methyl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(Compound 4):

Step-1: Synthesis of6-bromo-8-fluoro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one: To astirred solution of 6-bromo-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one(7.0 g, 28.56 mmol, 1 equiv) in DMF (70 mL), was added NaH (60%) (2.282g, 57.12 mmol, 2 equiv) at 0° C. and stirred for 30 min. at RT, followedby the addition of 2-iodopropane (5.6 mL, 57.12 mmol, 2 equiv). Thereaction mixture was heated to 80° C. for 3 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture cooled to RT and quenched with ice-cold water (100 mL)and extracted with EtOAc (150 mL×3), organic layer was washed with water(150 mL) and brine solution (150 mL). Organic layer dried over anhydrousNa₂SO₄ and concentrated under reduced pressure to obtain crude compound,which was purified by normal phase combi-flash to obtain6-bromo-8-fluoro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one (2.40g,29%) as off white solid compound.

LCMS 288 [M+H]⁺

Step-2: Synthesis of6-bromo-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine: To astirred solution of6-bromo-8-fluoro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one (1400 mg,4.87 mmol, 1 equiv) in THF (14 mL), was drop wise added BH₃. DMS (9.7mL, 7.66 mmol, 4 equiv) at 0° C. The reaction mixture was heated to 80°C. for 16 h. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, the reaction mixture was quenched withsaturated solution of NaHCO₃ (100 mL) and extracted with EtOAc (100mL×3). The combined organic layer was washed with water (100 mL) andbrine solution (100 mL). Organic layer dried over anhydrous Na₂SO₄ andconcentrated under reduced pressure to obtain6-bromo-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine (1200mg, 90%) as a yellow viscous compound.

LCMS 274 [M+H]⁺

Step-3: Synthesis of8-fluoro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine:To a stirred solution of6-bromo-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine (1200mg, 4.39 mmol, 1 equiv) in dioxane (12 mL), was added4,4,5,5-tetramethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,2-dioxaborolane(1340 mg, 5.27 mmol, 1.2 equiv) and Potassium acetate (1291 mg, 13.17mmol, 3 equiv). Aerated the reaction mixture with nitrogen gas for 15minutes. After addition of Pd(dppf) DCM (179 mg, 0.219 mmol, 0.5 equiv)again purge nitrogen for 5 min. The reaction mixture was heated to 100°C. for 4 h. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, the reaction mixture was diluted withwater (30 mL) and extracted with EtOAc (100 mL×2), organic layer waswashed with brine (100 mL). The organic layer dried over anhydrousNa₂SO₄ and concentrated under reduced pressure to obtain8-fluoro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(1000 mg, 69%) as a dark brown viscous compound.

LCMS 322.1 [M+H]⁺

Step-4: Synthesis of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine: To a stirred solution of2,4-dichloro-5-fluoropyrimidine (500 mg, 3.01 mmol, 1 equiv) and8-fluoro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(970.1 mg, 3.01 mmol, 1 equiv) in THF: Water (1:1, 16 mL) was addedPotassium carbonate (831 mg, 6.02 mmol, 2 equiv) and Pd(PPh₃)₄ (174 mg,0.15 mmol, 0.05 equiv). The reaction mixture was heated to 80° C. for 4h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the reaction mixture was diluted with water(30 mL) and extracted with EtOAc (100 mL×2), organic layer was washedwith water (100 mL) and brine solution (100 mL). The organic layer driedover anhydrous Na₂SO₄ and concentrated under reduced pressure to obtaincrude compound, which was purified by normal phase combi-flash to obtain6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(800 mg, 82%) as a yellow solid compound.

LCMS 326 [M+H]⁺

Step-5: Synthesis of N-(5-((4-ethylpiperazin-1-yl) methyl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(200 mg, 0.676 mmol, 1 equiv) in Dioxane (10 mL), was added5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-amine (149 mg, 1.015 mmol,1.1 equiv) and cesium carbonate (301 mg, 0.923 mmol, 1.5 equiv). Thereaction mixture was aerated with nitrogen gas for 30 min, followed bythe addition of palladium acetate (3 mg, 0.012 mmol, 0.02 equiv) andBINAP (15.3 mg, 0.024 mmol, 0.04 equiv) again purge nitrogen for 5 min.The resultant reaction mixture was heated to 100° C. for 16 h. Progressof the reaction was monitored by TLC and LCMS. After completion of thereaction, the reaction mixture was diluted with water (25 mL) extractedwith EtOAc (100 mL), organic layer was dried over anhydrous Na₂SO₄ andconcentrated under reduced pressure to obtain crude which was purifiedby reversed phase HPLC to obtainN-(5-((4(4-ethylpiperazin-1-yl)methyl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(35 mg) as a yellow solid compound.

LCMS 510.1 [M+H]⁺

¹HNMR (400 MHz, Methanol-d₄) δ 8.45 (s, 1H), 8.32 (s, 1H), 8.21 (s, 1H),7.76 (d, J=8.7 Hz, 1H), 7.54 (s, 1H), 7.30-7.22 (m, 1H), 4.33 (t, J=4.3Hz, 2H), 4.23 (p, J=6.7 Hz, 1H), 3.57 (s, 2H), 3.35 (t, J=4.5 Hz, 2H),2.85 (s, 2H), 2.66-2.59 (m, 8H), 1.27 (d, J=6.6 Hz, 6H), 1.15 (t, J=7.2Hz, 3H).

Example-5 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-(piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine(Compound 5):

Step-1: Synthesis of6-bromo-8-fluoro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one: To astirred solution of 6-bromo-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one(7000 mg, 28.56 mmol, 1 equiv) in DMF (70 mL), was added NaH (60%) (2282mg, 57.12 mmol, 2 equiv) at 0° C. and stirred for 30 min. at RT,followed by the addition of 2-iodopropane (5.6 mL, 57.12 mmol, 2 equiv).The reaction mixture was heated to 80° C. for 3 h. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, the reaction mixture cooled to RT and quenched with ice-coldwater (100 mL) and extracted with EtOAc (150 mL×3), organic layer waswashed with water (150 mL) and brine solution (150 mL). Organic layerdried over anhydrous Na₂SO₄ and concentrated under reduced pressure toobtain crude compound, which was purified by normal phase combi-flash toobtain 6-bromo-8-fluoro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one(2400 mg, 29%) as off white solid compound.

LCMS 288 [M+H]⁺

Step-2: Synthesis of6-bromo-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine: To astirred solution of6-bromo-8-fluoro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one (1400 mg,4.87 mmol, 1 equiv) in THF (14 mL), was drop wise added BH₃.DMS (9.7 mL,7.66 mmol, 4 equiv) at 0° C. The reaction mixture was heated to 80° C.for 16 h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the reaction mixture was quenched withsaturated solution of NaHCO₃ (100 mL) and extracted with EtOAc (100mL×3). The combined organic layer was washed with water (100 mL) andbrine solution (100 mL). Organic layer dried over anhydrous Na₂SO₄ andconcentrated under reduced pressure to obtain6-bromo-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine (1200mg, 90%) as a yellow viscous compound.

LCMS 274 [M+H]⁺

Step-3: Synthesis of8-fluoro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine:To a stirred solution of6-bromo-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine (1200mg, 4.39 mmol, 1 equiv) in dioxane (12 mL), was added4,4,5,5-tetramethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,2-dioxaborolane(1340 mg, 5.27 mmol, 1.2 equiv) and Potassium acetate (1291 mg, 13.17mmol, 3 equiv). Aerated the reaction mixture with nitrogen gas for 15minutes. After addition of Pd(dppf) DCM (179 mg, 0.219 mmol, 0.5 equiv)again purge nitrogen for 5 min. The reaction mixture was heated to 100°C. for 4 h. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, the reaction mixture was diluted withwater (30 mL) and extracted with EtOAc (100 mL×2), organic layer waswashed with brine (100 mL). The organic layer dried over anhydrousNa₂SO₄ and concentrated under reduced pressure to obtain8-fluoro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(1000 mg, 69%) as a dark brown viscous compound.

LCMS 322.1 [M+H]⁺

Step-4: Synthesis of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine: To a stirred solution of2,4-dichloro-5-fluoropyrimidine (500 mg, 3.01 mmol, 1 equiv) and8-fluoro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(970.1 mg, 3.01 mmol, 1 equiv) in THF: Water (1:1, 16 mL) was addedPotassium carbonate (831 mg, 6.02 mmol, 2 equiv) and Pd(PPh₃)₄ (174 mg,0.15 mmol, 0.05 equiv). The reaction mixture was heated to 80° C. for 4h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the reaction mixture was diluted with water(30 mL) and extracted with EtOAc (100 mL×2), organic layer was washedwith water (100 mL) and brine solution (100 mL). The organic layer driedover anhydrous Na₂SO₄ and concentrated under reduced pressure to obtaincrude compound, which was purified by normal phase combi-flash to obtain6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(800 mg, 82%) as a yellow solid compound.

LCMS 326 [M+H]⁺

Step-5: Synthesis of tert-butyl4-(2-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-4-yl)piperazine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(150 mg, 0.461 mmol, 1 equiv) in Dioxane (10 mL), was added tert-butyl4-(2-aminopyridin-4-yl)piperazine-1-carboxylate (141 mg, 0.507 mmol, 1.1equiv) and cesium carbonate (225.4 mg, 0.691 mmol, 1.5 equiv). Thereaction mixture was aerated with nitrogen gas for 30 min, followed bythe addition of palladium acetate (2 mg, 0.009 mmol, 0.02 equiv) andBINAP (12 mg, 0.018 mmol, 0.04 equiv) again purge nitrogen for 5 min.The resultant reaction mixture was stir at 100° C. for 16 h. Progress ofthe reaction was monitored by TLC and LCMS. After completion of thereaction, the reaction mixture was diluted with EtOAc (25 mL). Solidobserved was filtered and washed with EtOAc(20 mL) to obtain tert-butyl4-(2-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-4-yl)piperazine-1-carboxylate(140 mg, 53%) as a yellow solid compound.

LCMS 568.3 [M+H]⁺

Step-6: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-(piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine:Tert-butyl4-(2-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-4-yl)piperazine-1-carboxylate(140 mg, 0.246 mmol, 1 equiv) was taken in 1.25M HCl in ethanol (5 mL)and the resultant reaction mixture was stirred at RT for 16 h. Progressof the reaction was monitored by LCMS. After completion of the reaction,the reaction mixture was concentrated under vacuum to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-(piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine(110 mg, 83%) as a yellow solid compound.

LCMS 468.2 [M+H]⁺

¹HNMR (400 MHz, METHANOL-d₄) δ 8.61 (d, J=3.95 Hz, 1H), 8.02 (d, J=7.24Hz, 1H), 7.50 (s, 1H), 7.31 (d, J=11.40 Hz, 1H), 6.95-7.03 (m, 1H), 6.66(d, J=2.19 Hz, 1H), 4.31-4.37 (m, 2H), 4.22 (m, 1H), 3.92 (s, 4H), 3.42(s, 4H), 3.37-3.50 (m, 2H), 1.22-1.33 (d, 6H).

Example-6 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-(4-methylpiperazin-1-yl)phenyl)pyrimidin-2-amine(Compound 6):

Step-1: Synthesis of6-bromo-8-fluoro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one: To astirred solution of 6-bromo-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one(7000 mg, 28.56 mmol, 1 equiv) in DMF (70 mL), was added NaH (60%) (2282mg, 57.12 mmol, 2 equiv) at 0° C. and stirred for 30 min. at RT,followed by the addition of 2-iodopropane (5.6 mL, 57.12 mmol, 2 equiv).The reaction mixture was heated to 80° C. for 3 h. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, the reaction mixture cooled to RT and quenched with ice-coldwater (100 mL) and extracted with EtOAc (150 mL×3), organic layer waswashed with water (150 mL) and brine solution (150 mL). Organic layerdried over anhydrous Na₂SO₄ and concentrated under reduced pressure toobtain crude compound, which was purified by normal phase combi-flash toobtain 6-bromo-8-fluoro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one(2400 mg, 29%) as off white solid compound.

LCMS 288 [M+H]⁺

Step-2: Synthesis of6-bromo-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine: To astirred solution of6-bromo-8-fluoro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one (1400 mg,4.87 mmol, 1 equiv) in THF (14 mL), was drop wise added BH₃.DMS (9.7 mL,7.66 mmol, 4 equiv) at 0° C. The reaction mixture was heated to 80° C.for 16 h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the reaction mixture was quenched withsaturated solution of NaHCO₃ (100 mL) and extracted with EtOAc (100mL×3). The combined organic layer was washed with water (100 mL) andbrine solution (100 mL). Organic layer dried over anhydrous Na₂SO₄ andconcentrated under reduced pressure to obtain6-bromo-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine (1200mg, 90%) as a yellow viscous compound.

LCMS 274 [M+H]⁺

Step-3: Synthesis of8-fluoro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine:To a stirred solution of6-bromo-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine (1200mg, 4.39 mmol, 1 equiv) in dioxane (12 mL), was added4,4,5,5-tetramethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,2-dioxaborolane(1340 mg, 5.27 mmol, 1.2 equiv) and Potassium acetate (1291 mg, 13.17mmol, 3 equiv). Aerated the reaction mixture with nitrogen gas for 15minutes. After addition of Pd(dppf) DCM (179 mg, 0.219 mmol, 0.5 equiv)again purge nitrogen for 5 min. The reaction mixture was heated to 100°C. for 4 h. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, the reaction mixture was diluted withwater (30 mL) and extracted with EtOAc (100 mL×2), organic layer waswashed with brine (100 mL). The organic layer dried over anhydrousNa₂SO₄ and concentrated under reduced pressure to obtain8-fluoro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(1000 mg, 69%) as a dark brown viscous compound.

LCMS 322.1 [M+H]⁺

Step-4: Synthesis of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine: To a stirred solution of2,4-dichloro-5-fluoropyrimidine (500 mg, 3.01 mmol, 1 equiv) and8-fluoro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(970.1 mg, 3.01 mmol, 1 equiv) in THF: Water (1:1, 16 mL) was addedPotassium carbonate (831 mg, 6.02 mmol, 2 equiv) and Pd(PPh₃)₄ (174 mg,0.15 mmol, 0.05 equiv). The reaction mixture was heated to 80° C. for 4h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the reaction mixture was diluted with water(30 mL) and extracted with EtOAc (100 mL×2), organic layer was washedwith water (100 mL) and brine solution (100 mL). The organic layer driedover anhydrous Na₂SO₄ and concentrated under reduced pressure to obtaincrude compound, which was purified by normal phase combi-flash to obtain6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(800 mg, 82%) as a yellow solid compound.

LCMS 326 [M+H]⁺

Step-5: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-(4-methylpiperazin-1-yl)phenyl)pyrimidin-2-amine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(150 mg, 0.461 mmol, 1 equiv) in Dioxane (10 mL), was added4-(4-methylpiperazin-1-yl)aniline (97 mg, 0.507 mmol, 1.1 equiv) andcesium carbonate (225.4 mg, 0.691 mmol, 1.5 equiv). The reaction mixturewas aerated with nitrogen gas for 30 min, followed by the addition ofpalladium acetate (2 mg, 0.009 mmol, 0.02 equiv) and BINAP (12 mg, 0.018mmol, 0.04 equiv) again purge nitrogen for 5 min. The resultant reactionmixture was heated to 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with EtOAc (25 mL). Solid observed wasfiltered and washed with EtOAc (20 mL) to obtain crude compound, whichwas purified by reverse phase HPLC to afford5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-(4-methylpiperazin-1-yl)phenyl)pyrimidin-2-amine(100 mg, 45%) as a yellow solid compound.

LCMS 481.2 [M+H]⁺

¹HNMR (400 MHz, Methanol-d₄) δ 8.40 (d, J=3.95 Hz, 1H), 7.44-7.59 (m,J=8.77 Hz, 2H), 7.40 (s, 1H), 7.12 (d, J=11.62 Hz, 1H), 6.74-6.90 (m,J=8.99 Hz, 2H), 4.25 (s, 2H), 4.03-4.12 (m, 1H), 3.25 (s, 2H), 3.03 (s,4H), 2.44 (s, 4H), 2.18 (s, 3H), 1.14 (d, J=6.36 Hz, 6H).

Example-7 Synthesis of1-(6-(2-((5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-yl)amino)-5-fluoropyrimidin-4-yl)-8-fluoro-2,3-dihydro-4H-benzo[b][1,4]oxazin-4-yl)ethan-1-one(Compound 7):

Step-1: Synthesis of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine:6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine(9243 mg, 33.12 mmol, 1.1 equiv), 2,4-dichloro-5-fluoropyrimidine (5.0g,30.12 mmol, 1.0 equiv), Potassium carbonate (8.3 g, 60.24 mmol, 2equiv), Pd(PPh₃)₄ (1.74g, 1.50 mmol, 0.05 equiv) and THF: Water (1:1=40mL) were charged. The reaction mixture was allowed to stir at 80° C. forovernight. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the reaction mixture was diluted with water(100 mL) and extracted with EtOAc (100 mL×2), organic layer was washedwith water (200 mL), brine solution (200 mL) and dried over anhydrousNa₂SO_(4.) Concentrated under reduced pressure to obtain crude compound,which was purified by ether and pentane washing, recrystallization toobtain6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine(4000 mg,) as a yellow solid compound.

LCMS 284 [M+H]⁺

Step-2: Synthesis of1-(6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-2,3-dihydro-4H-benzo[b][1,4]oxazin-4-yl)ethan-1-one:To a stirred solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine(300 mg, 1.06 mmol, 1 equiv) in DCM (20 mL), was added triethyl amine(0.37 ml, 2.65 mmol, 2.5 equiv) at 0° C. Stir the reaction mixture for30 min. at RT, followed by the addition of acetyl chloride (124 mg, 1.59mmol). The reaction mixture was allowed to stir at RT for 16 h. Progressof the reaction was monitored by TLC and LCMS. After completion of thereaction, the reaction mixture was diluted with water (50 mL) andextracted with EtOAc (50 mL×3), organic layer was washed with NaHCO₃(100 mL), brine solution (100 mL) and dried over anhydrous Na₂SO_(4.)Concentrated under reduced pressure to obtain crude compound, which waspurified by recrystallization in ether and pentane to obtain1-(6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-2,3-dihydro-4H-benzo[b][1,4]oxazin-4-yl)ethan-1-one(200 mg) as off white solid compound.

LCMS 326 [M+H]⁺

Step-3: Synthesis of1-(6-(2-((5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-yl)amino)-5-fluoropyrimidin-4-yl)-8-fluoro-2,3-dihydro-4H-benzo[b][1,4]oxazin-4-yl)ethan-1-one:To a solution of1-(6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-2,3-dihydro-4H-benzo[b][1,4]oxazin-4-yl)ethan-1-one(200 mg, 0.676 mmol, 1 equiv) in Dioxane (10 mL), was added5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-amine (162 mg, 0.738 mmol,1.1 equiv) and cesium carbonate (299 mg, 0.918 mmol, 1.5 equiv). Thereaction mixture was aerated with nitrogen gas for 30 min, followed bythe addition of palladium acetate (6.8 mg, 0.030 mmol, 0.05 equiv) andBINAP (19.12 mg, 0.030 mmol, 0.05 equiv). The resultant reaction mixturewas stir at 100° C. for 16 h. Progress of the reaction was monitored byTLC and LCMS. After completion of the reaction, the reaction mixture wasdiluted with water (50 mL) and extracted with EtOAc (50 mL×2), organiclayer was washed with NaHCO₃ (100 mL), brine solution (50 mL×3) anddried over anhydrous Na₂SO₄. Concentrated under reduced pressure toobtain crude compound, which was purified by reverse phase combi-flashchromatography to obtain1-(6-(2-((5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-yl)amino)-5-fluoropyrimidin-4-yl)-8-fluoro-2,3-dihydro-4H-benzo[b][1,4]oxazin-4-yl)ethan-1-one(50 mg, 97.84%) as a yellow solid compound.

LCMS 510.1 [M+H]⁺

¹HNMR (400 MHz, DMSO-d₆) δ 9.96 (s, 1H), 8.66 (d, J=3.95 Hz, 1H),8.12-8.28 (m, 2H), 7.62-7.77 (m, 2H), 4.34-4.54 (m, 2H), 3.92-4.03 (m,1H), 3.43 (s, 2H), 2.21-2.44 (m, 7H), 0.97 (t, J=7.24 Hz, 2H)21-2.44 (m,10H), 0.97 (t, J=7.24 Hz, 3H).

Example-8 Synthesis ofcyclopropyl(6-(2-((5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-yl)amino)-5-fluoropyrimidin-4-yl)-8-fluoro-2,3-dihydro-4H-benzo[b][1,4]oxazin-4-yl)methanone(Compound 8):

Step-1: Synthesis of(6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-2,3-dihydro-4H-benzo[b][1,4]oxazin-4-yl)(cyclopropyl)methanone:To a stirred solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine(300 mg, 1.06 mmol, 1 equiv) in DCM (10 mL), was added triethyl amine(0.37 ml, 2.65 mmol, 2.5 equiv) at 0° C. Stirred the reaction mixturefor 30 min at RT, followed by addition of cyclopropanecarbonyl chloride(165 mg, 1.59 mmol). The reaction mixture was allowed to stir at RT for16h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the reaction mixture was diluted with water(50 mL) and extracted with EtOAc (50 mL×3), organic layer was washedwith NaHCO₃ (100 mL), brine solution (100 mL) and dried over anhydrousNa₂SO₄. Concentrated under reduced pressure to obtain crude compound,which was purified by recrystallization in ether and pentane to obtain(6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-2,3-dihydro-4H-benzo[b][1,4]oxazin-4-yl)(cyclopropyl)methanone(300 mg) as off white solid compound.

LCMS 352 [M+H]⁺

Step-2:Synthesis ofcyclopropyl(6-(2-((5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-yl)amino)-5-fluoropyrimidin-4-yl)-8-fluoro-2,3-dihydro-4H-benzo[b][1,4]oxazin-4-yl)methanone:To a solution of(6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-2,3-dihydro-4H-benzo[b][1,4]oxazin-4-yl)(cyclopropyl)methanone(200 mg, 0.676 mmol, 1 equiv) in Dioxane (10 mL), was added5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-amine (162 mg, 0.738 mmol,1.1 equiv) and cesium carbonate (299 mg, 0.918 mmol, 1.5 equiv). Thereaction mixture was aerated with nitrogen gas for 30 min, followed bythe addition of palladium acetate (6.8 mg, 0.030 mmol, 0.05 equiv) andBINAP (19.12 mg, 0.030 mmol, 0.05 equiv). The resultant reaction mixturewas stir at 100° C. for 16 h. Progress of the reaction was monitored byTLC and LCMS. After completion of the reaction, the reaction mixture wasdiluted with water (50 mL) and extracted with EtOAc (50 mL×2), organiclayer was washed with NaHCO₃ (100 mL), brine solution (50 mL×3) anddried over anhydrous Na₂SO₄. Concentrated under reduced pressure toobtain crude compound, which was purified by reverse phase combi-flashchromatography to obtaincyclopropyl(6-(2-((5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-yl)amino)-5-fluoropyrimidin-4-yl)-8-fluoro-2,3-dihydro-4H-benzo[b][1,4]oxazin-4-yl)methanone(80 mg) as a yellow solid compound.

LCMS 536 [M+H]⁺

¹H NMR (400 MHz, DMSO-d₆) δ 9.98 (s, 1H), 8.66 (d, J=3.95 Hz, 1H), 8.43(br. s, 1H), 8.11-8.27 (m, 2H), 7.63-7.80 (m, 2H), 4.47 (t, J=4.17 Hz,2H), 4.09 (br. s, 2H), 3.42 (s, 3H), 2.38 (br. s, 3H), 2.24-2.35 (m,4H), 2.11-2.24 (m, 5H), 0.94-1.06 (m, 3H), 0.89 (dd, J=3.73, 6.80 Hz,2H).

Example-9 Synthesis of4-(4-(4-aminocyclohexyl)-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-yl)-5-fluoropyrimidin-2-amine(Compound 9):

Step-1: Synthesis of tert-butyl(4-(6-(2-((5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-yl)amino)-5-fluoropyrimidin-4-yl)-8-fluoro-2,3-dihydro-4H-benzo[b][1,4]oxazin-4-yl)cyclohexyl)carbamate:To a solution of4-(4-((tert-butoxycarbonyl)amino)cyclohexyl)-6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-2H-benzo[b][1,4]oxazin-4-ium(100 mg, 0.31 mmol, 1 equiv) in dioxane (4 mL), was added5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-amine (82 mg, 0.34 mmol, 1.1equiv), and cesium carbonate (151 mg, 0.47 mmol, 1.5 equiv). Thereaction mass was degassed by the purging nitrogen for 10 min. After 10min, BINAP (6.5 mg, 0.0123 mmol, 0.04 equiv), and Pd(OAc)₂ (1.4 mg,0.0062 mmol, 0.02 equiv) were added, followed by nitrogen purging for 10min. Resultant reaction mixture was stirred at 100° C. for 16 h.Reaction was monitored by LCMS. After completion of reaction, reactionmass was diluted with water (5 mL) and extracted with EtOAc (3×10 mL).Organic layer was passed through the anhydrous Na₂SO₄, filtered andconcentrated the organic layer under reduced pressure to afford 200 mgcrude desired product. Crude compound was purified by combi-flash andfurther purified by reverse phase HPLC to afford 30 mg tert-butyl(4-(6-(2-((5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-yl)amino)-5-fluoropyrimidin-4-yl)-8-fluoro-2,3-dihydro-4H-benzo[b][1,4]oxazin-4-yl)cyclohexyl)carbamate.

LCMS 665 [M+H]⁺

Step-2: Synthesis of4-(4-(4-aminocyclohexyl)-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-yl)-5-fluoropyrimidin-2-amine:To a solution of tert-butyl(4-(6-(2-((5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-yl)amino)-5-fluoropyrimidin-4-yl)-8-fluoro-2,3-dihydro-4H-benzo[b][1,4]oxazin-4-yl)cyclohexyl)carbamate(20 mg) in 1.25M ethanolic HCl (3 mL). The resultant reaction mixturewas stirred at 40° C. for 16 h. Reaction was monitored by LCMS. Aftercompletion of reaction, filtered the solid product and washed withdiethyl ether and dried under reduced pressure to afford 10 mg of4-(4-(4-aminocyclohexyl)-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-yl)-5-fluoropyrimidin-2-aminehydrochloride.

LCMS 565 [M+H]⁺

¹H NMR (400 MHz, Methanol-d4) δ 8.73 (s, 1H), 8.65-8.42 (m, 2H), 7.69(t, J=13.2 Hz, 1H), 7.57 (s,1H), 7.38 (d, J=11.3 Hz, 1H), 4.36 (d,J=25.9 Hz, 4H), 3.96-3.36 (m, 14H), 3.20 (d, J=18.4 Hz, 5H), 2.18 (s,2H), 2.03-1.88 (m, 5H), 1.76 (s, 7H), 1.45-1.22 (m, 6H), 1.21 (s, 4H),0.89 (dd, J=16.3, 7.6 Hz, 2H).

Example-10 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(3-methylpiperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine(Compound 10):

Step-1: Synthesis of tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-2-methylpiperazine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.31 mmol, 1 equiv) in dioxane (5 mL), was tert-butyl4-(6-aminopyridin-3-yl)-2-methylpiperazine-1-carboxylate (98 mg, 0.34mmol, 1.1 equiv), and cesium carbonate (151 mg, 0.47 mmol, 1.5 equiv).The reaction mass was degassed by the purging nitrogen for 10 min. After10 min, BINAP (7.7 mg, 0.0123 mmol, 0.04 equiv), and Pd(OAc)₂ (1.4 mg,0.0062 mmol, 0.02 equiv) were added, followed by nitrogen purging for 10min. Resultant reaction mixture was stirred at 100° C. for 28 h.Reaction was monitored by LCMS. After completion of reaction, reactionmass was diluted with water (5 mL) and extracted with EtOAc (3×10 mL).Organic layer was passed through the anhydrous Na₂SO₄, filtered andconcentrated the organic layer under reduced pressure to afford 200 mgcrude desired product. Crude compound was purified by combi-flash andfurther purified by reverse phase HPLC to afford 50 mg of tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-2-methylpiperazine-1-carboxylate.

LCMS 582 [M+H]⁺

Step-2: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(3-methylpiperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine:To a solution of tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-2-methylpiperazine-1-carboxylate(50 mg) in 1.25M ethanolic HCl (3 mL). The resultant reaction mixturewas stirred at RT for 16 h. Reaction was monitored by LCMS. Aftercompletion of reaction, filtered the solid product and purified byreverse phase HPLC to afford 13 mg of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(3-methylpiperazin-1-yl)pyridin-2-yl)pyrimidin-2-aminehydrochloride.

LCMS 482 [M+H]⁺

¹H NMR (400 MHz, Methanol-d4) δ 8.40 (d, J=4.0 Hz, 1H), 8.18 (d, J=9.1Hz, 1H), 8.04-7.98 (m, 1H), 7.50 (q, J=4.2,3.5 Hz, 2H), 7.24 (d, J=11.6Hz, 1H), 4.36-4.29 (m, 2H), 4.21 (p, J=6.8 Hz, 1H), 3.62 (t, J=13.8 Hz,2H), 3.39-3.33 (m, 2H), 3.26 (s, 3H), 3.21-3.13 (m, 1H), 2.88 (t, J=11.6Hz, 1H), 2.59 (t, J=11.3 Hz, 1H), 1.94 (s, 4H), 1.27 (dd, J=10.9, 6.4Hz, 12H), 0.90 (s, 1H).

Example-11 Synthesis of5-fluoro-N-(2-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(Compound 11):

Step-1: Synthesis of tert-butyl4-(3-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.31 mmol, 1 equiv) in dioxane (4 mL), was tert-butyl4-(4-amino-3-fluorophenyl)piperazine-1-carboxylate (101 mg, 0.34 mmol,1.1 equiv), and cesium carbonate (151 mg, 0.47 mmol, 1.5 equiv). Thereaction mass was degassed by the purging nitrogen for 10 min. After 10min, BINAP (7.7 mg, 0.0123 mmol, 0.04 equiv), and Pd(OAc)₂ (1.4 mg,0.0062 mmol, 0.02 equiv) were added, followed by nitrogen purging for 10min. Resultant reaction mixture was stirred at 100° C. for 24 h.Reaction was monitored by LCMS. After completion of reaction, reactionmass was diluted with water (5 mL) and extracted with EtOAc (20 mL×3).Organic layer was passed through the anhydrous Na₂SO₄, filtered andconcentrated the organic layer under reduced pressure to afford crudedesired product. Crude compound was purified by purified by reversephase HPLC to afford 75 mg of tert-butyl4-(3-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate.

LCMS 585 [M+H]⁺

Step-2: Synthesis of5-fluoro-N-(2-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a solution of tert-butyl4-(3-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate(75 mg) in 1.25M ethanolic HCl (3 mL). The resultant reaction mixturewas stirred at 50° C. for 1 h. Reaction was monitored by LCMS. Aftercompletion of reaction, filtered the solid product and dried underreduced pressure to afford 71 mg of5-fluoro-N-(2-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-aminehydrochloride.

LCMS 485 [M+H]⁺

¹H NMR (400 MHz, Methanol-d4) δ 8.40 (d, J=4.5 Hz, 1H), 7.64 (d, J=9.3Hz, 1H), 7.50 (s, 1H), 7.30 (d, J=11.4 Hz, 1H), 7.02-6.89 (m, 2H),4.37-4.30 (m, 2H), 4.10 (h, J=5.6 Hz, 1H), 3.50 (s, 4H), 3.39 (s, 3H),1.22 (d, J=6.1 Hz, 6H).

Example-12 Synthesis of5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-aminehydrochloride (Compound 12):

Step-1: Synthesis of tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.31 mmol, 1 equiv) in dioxane (4 mL), was added tert-butyl4-(4-amino-2-fluorophenyl)piperazine-1-carboxylate (82 mg, 0.34 mmol,1.1 equiv), and cesium carbonate (151 mg, 0.47 mmol, 1.5 equiv). Thereaction mass was degassed by the purging nitrogen for 10 min. After 10min, BINAP (6.5 mg, 0.0123 mmol, 0.04 equiv), and Pd(OAc)₂ (1.4 mg,0.0062 mmol, 0.02 equiv) were added, followed by nitrogen purging for 10min. Resultant reaction mixture was stirred at 100° C. for 16 h.Reaction was monitored by LCMS. After completion of reaction, reactionmass was diluted with water (5 mL) and extracted with EtOAc (10 mL×3).Organic layer was passed through the anhydrous Na₂SO₄, filtered andconcentrated the organic layer under reduced pressure to afford 200 mgcrude desired product. Crude compound was purified by combi-flash andfurther purified by reverse phase HPLC to afford 30 mg of tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate.

LCMS 585 [M+H]⁺

Step-2: Synthesis of5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-aminehydrochloride: To a solution of tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate(20 mg) in 1.25M ethanolic HCl (3 mL). The resultant reaction mixturewas stirred at 40° C. for 16 h. Reaction was monitored by LCMS. Aftercompletion of reaction, filtered the solid product and washed withdiethyl ether and dried under reduced pressure to afford 10 mg of5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-aminehydrochloride.

LCMS 485 [M+H]⁺

¹H NMR (400 MHz, Methanol-d4) δ 8.38 (d, J=4.3 Hz, 1H), 7.82 (dd,J=14.9, 2.5 Hz, 1H), 7.56 (s, 1H), 7.36-7.29 (m, 1H), 7.29-7.23 (m, 1H),7.07 (t, J=9.2 Hz, 1H), 4.37-4.19 (m, 3H), 3.44-3.25 (m, 10H), 2.68 (d,J=15.3 Hz, 1H), 1.55 (s, 2H), 1.32-1.27 (m, 3H), 1.26 (d, J=6.6 Hz, 6H),0.88 (dd, J=12.7, 6.8 Hz, 2H).

Example-13 Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-6-amine(Compound 13):

Step-1: Synthesis of tert-butyl6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinoline-2(1H)-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(200 mg, 0.61 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl6-amino-3,4-dihydroisoquinoline-2(1H)-carboxylate (168 mg, 0.67 mmol,1.1 equiv) and cesium carbonate (298 mg, 0.91 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (3 mg, 0.01 mmol, 0.02 equiv) andBINAP (15 mg, 0.02 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with EtOAc (100 mL). Organic layer waswashed with water (50 mL) and brine solution (50 mL). Organic layer wasdried over anhydrous Na₂SO₄ and concentrated under reduced pressure toobtain crude, which was purified by normal phase combi flash to obtaintert-butyl6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinoline-2(1H)-carboxylate(80 mg, 24%) as a yellow solid compound.

LCMS 538.4[M+H]⁺

Step-2: Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-6-amine:A solution of tert-butyl6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinoline-2(1H)-carboxylate(90 mg, 0.11 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtainN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-6-amine(40 mg, 91%) as a brick red color solid compound.

LCMS 438.4 [M+H]⁺

¹HNMR (400 MHz, DMSO-d6) δ 9.75 (s, 1H), 9.41 (s, 1H), 8.58 (d, J=3.9Hz, 1H), 7.68-7.59 (m,2H), 7.40 (s, 1H), 7.15 (dd, J=15.4, 10.0 Hz, 2H),4.30 (t, J=4.2 Hz, 2H), 4.16 (dt, J=25.2,5.7 Hz,3H), 3.33 (dt, J=17.4,4.3 Hz, 4H), 2.98 (t, J=6.3 Hz, 2H), 1.19 (d, J=6.5 Hz, 6H).

Example-14 Synthesis of 5-fluoro-N-(3-fluoro-4-(4-methylpiperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine (Compound 14):

Step-1: Synthesis of tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(300 mg, 0.92 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(4-amino-2-fluorophenyl)piperazine-1-carboxylate (300 mg, 1.01 mmol,1.1 equiv) and cesium carbonate (450 mg, 1.38 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (4 mg, 0.01 mmol, 0.02 equiv) andBINAP (23 mg, 0.03 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with EtOAc (100 mL). Organic layer waswashed with water (50 mL) and brine solution (50 mL). Organic layer wasdried over anhydrous Na₂SO₄ and concentrated under reduced pressure toobtain crude, which was purified by normal phase combi flash to obtaintert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate(95 mg, 18%) as a yellow solid compound.

LCMS 584 [M+H]⁺

Step-2: Synthesis of 5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:A solution of tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate(85 mg, 0.15 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain 5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(80 mg, 95%) as an orange colour solid compound.

LCMS 484 [M+H]⁺

Step-3: Synthesis of 5-fluoro-N-(3-fluoro-4-(4-methylpiperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine: To a stirred solution of5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(80 mg, 0.15 mmol, 1 equiv) in DCE (5 mL), was added HCHO in water (0.02mL, 0.46 mmol, 3 equiv), acetic acid (0.05 mL, 0.75 mmol, 5 equiv). Thereaction mixture was allowed to stir at RT for 1 h. The reaction mixturewas cooled to 0° C. NaCNBH₃ (29 mg, 0.46 mmol, 3 equiv) was added toabove mixture and raise the temperature to RT. The reaction mixture wasallowed to stir at RT for 1 h. Progress of the reaction was monitored byLCMS. After completion of the reaction, the reaction mixture was dilutedwith water (25 mL) and extracted with EtOAc (50 mL×2). Organic layer waswashed with water (50 mL) and brine solution (50 mL). Organic layer wasdried over anhydrous Na₂SO₄ and concentrated under reduced pressure toobtain crude, which was purified by reverse phase HPLC to afford5-fluoro-N-(3-fluoro-4-(4-methylpiperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(15 mg, 19%) as a yellow solid compound. LCMS 499 [M+H]⁺

¹HNMR (400 MHz, DMSO-d6) δ 9.78 (s, 1H), 8.57 (d, J=3.9 Hz, 1H), 7.78(dd, J=15.2, 2.5 Hz, 1H),7.45-7.35 (m, 2H), 7.16 (d, J=11.6 Hz, 1H),7.03 (t, J=9.3 Hz, 1H), 4.30 (t, J=4.1 Hz, 2H), 4.15 (p, J=6.7 Hz, 1H),3.13-2.95 (m, 10H), 2.63 (s, 3H), 1.19 (d, J=6.4 Hz, 6H).

Example-15 Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-5-amine(Compound 15):

Step-1: Synthesis of tert-butyl5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinoline-2(1H)-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(200 mg, 0.61 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl5-amino-3,4-dihydroisoquinoline-2(1H)-carboxylate (168 mg, 0.67 mmol,1.1 equiv) and cesium carbonate (298 mg, 0.91 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (3 mg, 0.01 mmol, 0.02 equiv) andBINAP (15 mg, 0.02 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with EtOAc (100 mL). Organic layer waswashed with water (50 mL) and brine solution (50 mL). Organic layer wasdried over anhydrous Na₂SO₄ and concentrated under reduced pressure toobtain crude, which was purified by normal phase combi flash totert-butyl5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinoline-2(1H)-carboxylate(120 mg, 36%) as a yellow solid compound.

LCMS 538.4[M+H]⁺

Step-2: Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-5-amine:A solution of tert-butyl5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinoline-2(1H)-carboxylate(70 mg, 0.13 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtainN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-5-amine(55 mg, 89%) as a brick red color solid compound.

LCMS 438.4 [M+H]⁺

¹HNMR (400 MHz, DMSO-d6) δ 9.45 (d, J=5.7 Hz, 1H), 9.01 (s, 1H), 8.48(d, J=4.0 Hz, 1H), 7.59(d, J=7.9 Hz, 1H), 7.33 (s, 1H), 7.25 (t, J=7.8Hz, 1H), 7.07 (dd, J=28.2, 9.6 Hz, 2H), 4.27 (q, J=5.3,4.6 Hz, 4H), 4.04(h, J=6.8 Hz, 1H), 3.31 (dt, J=24.7, 4.6 Hz, 4H), 2.97 (t, J=6.3 Hz,2H), 1.15 (d, J=6.5 Hz, 6H).

Example-16 Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-7-amine(Compound 16):

Step-1: Synthesis of tert-butyl7-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinoline-2(1H)-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(200 mg, 0.61 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl7-amino-3,4-dihydroisoquinoline-2(1H)-carboxylate (168 mg, 0.67 mmol,1.1 equiv) and cesium carbonate (298 mg, 0.91 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (3 mg, 0.01 mmol, 0.02 equiv) andBINAP (15 mg, 0.02 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with EtOAc (100 mL). Organic layer waswashed with water (50 mL) and brine solution (50 mL). Organic layer wasdried over anhydrous Na₂SO₄ and concentrated under reduced pressure toobtain crude, which was purified by normal phase combi flash to obtaintert-butyl7-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinoline-2(1H)-carboxylate(100 mg, 30%) as a yellow solid compound.

LCMS 538.4 [M+H]⁺

Step-2: Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-7-amine:A solution of tert-butyl7-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinoline-2(1H)-carboxylate(90 mg, 0.11 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtainN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-7-amine(80 mg, 79%) as a brick red color solid compound.

LCMS 438.4 [M+H]⁺

¹HNMR (400 MHz, DMSO-d6) δ 9.75 (s, 1H), 9.41 (s, 1H), 8.58 (d, J=3.9Hz, 1H), 7.68-7.59 (m, 2H), 7.40 (s, 1H), 7.15 (dd, J=15.4, 10.0 Hz,2H), 4.30 (t, J=4.2 Hz, 4H), 4.16 (dt, J=25.2,5.7 Hz,1H), 3.33 (dt,J=17.4, 4.3 Hz, 4H), 2.98 (t, J=6.3 Hz, 2H), 1.19 (d, J=6.5 Hz, 6H).

Example-17 Synthesis of5-fluoro-N-(3-fluoro-4-(4-isopropylpiperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(Compound 17):

Step-1: Synthesis of 5-fluoro-N-(3-fluoro-4-(4-isopropylpiperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a stirred solution of5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(30 mg, 0.06 mmol, 1 equiv) in DCE (5 mL), was added Acetone (0.01 mL,0.18 mmol, 3 equiv), acetic acid (0.01 mL, 0.3 mmol, 5 equiv). Thereaction mixture was allowed to stir at RT for 1 h. The reaction mixturewas cooled to 0° C. NaCNBH₃ (11 mg, 0.18 mmol, 3 equiv) was added toabove mixture and raise the temperature to RT. The reaction mixture wasallowed to stir at RT for 1 h. Progress of the reaction was monitored byLCMS. After completion of the reaction, the reaction mixture was dilutedwith water (25 mL) and extracted with EtOAc (50 mL×2). Organic layer waswashed with water (50 mL) and brine solution (50 mL). Organic layer wasdried over anhydrous Na₂SO₄ and concentrated under reduced pressure toobtain crude, which was purified by reverse phase HPLC to afford5-fluoro-N-(3-fluoro-4-(4-isopropylpiperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(5 mg, 15%) as a yellow solid compound.

LCMS 527 [M+H]⁺

¹HNMR (400 MHz, DMSO-d6) δ 9.71 (s, 1H), 8.56 (d, J=4.0 Hz, 1H), 7.72(dd, J=15.4, 2.5 Hz, 1H),7.44 (s, 1H), 7.37 (d, J=8.2 Hz, 1H), 7.15 (d,J=11.5 Hz, 1H), 6.96 (t, J=9.4 Hz, 1H), 4.30 (t, J=4.4 Hz, 2H), 4.13(dp, J=15.2,5.9, 5.3 Hz, 1H), 3.18-3.04 (m, 2H), 2.94 (t, J=4.6 Hz, 4H),2.58 (t, J=4.8 Hz, 4H), 2.08 (s, 1H), 1.18 (d, J=6.5 Hz, 6H), 1.00 (d,J=6.5 Hz, 6H).

Example-18 Synthesis of 5-fluoro-N-(3-fluoro-4-(piperidin-4-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine (Compound 18):

Step-1: Synthesis of tert-butyl4-(2-fluoro-4-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(150 mg, 0.46 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(4-amino-2-fluorophenyl)piperidine-1-carboxylate (148 mg, 0.50 mmol,1.1 equiv) and cesium carbonate (225 mg, 0.69 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (3 mg, 0.009 mmol, 0.02 equiv) andBINAP (12 mg, 0.018 mmol, 0.04 equiv). The resultant reaction mixturewas allowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperidine-1-carboxylate(80 mg, 30%) as a yellow solid compound.

LCMS: 584[M+H]⁺

Step-2: Synthesis of 5-fluoro-N-(3-fluoro-4-(piperidin-4-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine: A solution of tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperidine-1-carboxylate(50 mg, 0.08 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain 5-fluoro-N-(3-fluoro-4-(piperidin-4-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(34 mg, 83%) as a brick red color solid compound.

LCMS: 484 [M+H]⁺

¹H NMR: (400 MHz, DMSO-d6) δ 9.93 (s, 1H), 8.84 (d, J=11.4 Hz, 1H), 8.62(dd, J=15.0, 7.6 Hz,1H), 7.80 (dd, J=13.6, 2.4 Hz, 1H), 7.45 (d, J=7.5Hz, 2H), 7.16 (dd, J=11.0, 5.6 Hz, 2H), 4.30 (t, J=4.1 Hz, 2H), 4.17 (p,J=6.6 Hz, 1H), 3.40-3.28 (m, 4H), 3.13-2.96 (m, 3H), 1.88 (h, J=4.0 Hz,4H),1.19 (d, J=6.5 Hz, 6H).

Example-19 Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-2-isopropyl-1,2,3,4-tetrahydroisoquinolin-7-amine(Compound 19):

Step-1: Synthesis of tert-butyl7-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinoline-2(1H)-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(200 mg, 0.61 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl7-amino-3,4-dihydroisoquinoline-2(1H)-carboxylate (168 mg, 0.67 mmol,1.1 equiv) and cesium carbonate (298 mg, 0.91 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (3 mg, 0.01 mmol, 0.02 equiv) andBINAP (15 mg, 0.02 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to obtain tert-butyl7-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinoline-2(1H)-carboxylate(100 mg, 30%) as a yellow solid compound.

LCMS: 538.4[M+H]⁺

Step-2: Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-7-amine:A solution of tert-butyl7-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinoline-2(1H)-carboxylate(40 mg, 0.07 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 hat 50° C. Progress of the reaction was monitored by LCMS.After completion of the reaction, solvent was removed under reducedpressure to obtainN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-7-amine(30 mg, 94%) as a brick red color solid compound.

LCMS: 438.4 [M+H]⁺

Step-3: Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-2-isopropyl-1,2,3,4-tetrahydroisoquinolin-7-amine:To a stirred solution ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-7-amine(50 mg, 0.1 mmol, 1 equiv) in DCE (5 mL), was added Acetone (0.02 mL,0.3mmo1,3 equiv), acetic acid (0.03 mL, 0.5 mmol, 5 equiv). The reactionmixture was allowed to stir at RT for 1 h. The reaction mixture wascooled to 0° C. NaCNBH₃ (19 mg, 0.3 mmol, 3 equiv) was added to abovemixture and raise the temperature to RT. The reaction mixture wasallowed to stir at RT for 1 h. Progress of the reaction was monitored byLCMS. After completion of the reaction, the reaction mixture was dilutedwith water (25 mL) and extracted with ethyl acetate (50 mL×2). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to affordN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-2-isopropyl-1,2,3,4-tetrahydroisoquinolin-7-amine(10 mg, 20%) as a yellow solid compound.

LCMS: 480 [M+H]⁺

¹HNMR: (400 MHz, DMSO-d6) δ 9.57 (s, 1H), 8.54 (d, J=3.9 Hz, 1H), 7.49(dd, J=8.3, 2.3 Hz, 1H),7.44-7.37 (m, 2H), 7.16 (d, J=11.5 Hz, 1H), 6.98(d, J=8.3 Hz, 1H), 4.29 (t, J=4.4 Hz, 2H), 4.12 (p,J=6.7 Hz, 1H), 3.60(s, 2H), 3.30 (t, J=4.4 Hz, 2H), 2.84 (dq, J=14.6, 8.1, 7.3 Hz, 1H),2.72 (t, J=5.5 Hz, 2H), 2.67 (t, J=5.7 Hz, 2H), 1.18 (d, J=6.5 Hz, 6H),1.05 (d, J=6.5 Hz, 6H).

Example-20 Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-2-isopropyl-1,2,3,4-tetrahydroisoquinolin-5-amine(Compound 20):

Step-1: Synthesis of tert-butyl5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinoline-2(1H)-carboxylate:o a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(200 mg, 0.61 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl5-amino-3,4-dihydroisoquinoline-2(1H)-carboxylate (168 mg, 0.67 mmol,1.1 equiv) and cesium carbonate (298 mg, 0.91 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (3 mg, 0.01 mmol, 0.02 equiv) andBINAP (15 mg, 0.02 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to tert-butyl5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinoline-2(1H)-carboxylate(120 mg, 36%) as a yellow solid compound.

LCMS: 538.4 [M+H]⁺

Step-2 Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-5-amine:A solution of tert-butyl5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinoline-2(1H)-carboxylate(50 mg, 0.09 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtainN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-5-amine(35 mg, 88%) as a brick red color solid compound.

LCMS: 438.4 [M+H]⁺

Step-3: Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-2-isopropyl-1,2,3,4-tetrahydroisoquinolin-5-amin:To a stirred solution ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-5-amine(50 mg, 0.1 mmol, 1 equiv) in DCE (5 mL), was added Acetone (0.02 mL,0.3mmo1,3 equiv), acetic acid (0.03 mL, 0.5 mmol, 5 equiv). The reactionmixture was allowed to stir at RT for 1 h. The reaction mixture wascooled to 0° C. NaCNBH₃ (19 mg, 0.3 mmol, 3 equiv) was added to abovemixture and raise the temperature to RT. The reaction mixture wasallowed to stir at RT for 1 h. Progress of the reaction was monitored byLCMS. After completion of the reaction, the reaction mixture was dilutedwith water (25 mL) and extracted with ethyl acetate (50 mL×2). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to affordN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-2-isopropyl-1,2,3,4-tetrahydroisoquinolin-5-amine(15 mg, 30%) as a yellow solid compound.

LCMS: 480 [M+H]⁺

¹HNMR: (400 MHz, DMSO-d6) δ 8.78 (s, 1H), 8.46 (d, J=4.0 Hz, 1H),7.38-7.29 (m, 2H), 7.13-7.06(m, 2H), 6.89 (d, J=7.6 Hz, 1H), 4.27 (t,J=4.4 Hz, 2H), 4.03-3.97 (m, 1H), 3.64 (s, 2H), 3.26 (t, J=4.3 Hz, 2H),2.86-2.79 (m, 1H), 2.69 (d, J=5.7 Hz, 2H), 2.65 (d, J=5.4 Hz, 2H),1.11(d, J=6.5 Hz, 6H), 1.04 (d, J=6.5 Hz, 6H).

Example-21 Synthesis of5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl) amino)-2-(piperazin-1-yl) benzonitrile (Compound 21):

Step-1: Synthesis of tert-butyl4-(2-cyano-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(150 mg, 0.46 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(4-amino-2-cyanophenyl)piperazine-1-carboxylate (168 mg, 0.67 mmol,1.1 equiv) and cesium carbonate (225 mg, 0.69 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (2 mg, 0.009 mmol, 0.02 equiv) andBINAP (12 mg, 0.018 mmol, 0.04 equiv). The resultant reaction mixturewas allowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to obtain tert-butyl4-(2-cyano-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate(100 mg, 37%) as a yellow solid compound.

LCMS: 592 [M+H]⁺

Step-2: Synthesis of5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl) amino)-2-(piperazin-1-yl) benzonitrile: A solution oftert-butyl4-(2-cyano-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate(100 mg, 0.16 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-(piperazin-1-yl)benzonitrile(80 mg, 97%) as a brick red compound.

LCMS: 492 [M+H]⁺

¹HNMR: (400 MHz, DMSO-d6) δ 9.95 (s, 1H), 9.28 (s, 1H), 8.61 (d, J=3.7Hz, 1H), 8.18 (d, J=2.4 Hz, 1H), 7.91 (dd, J=9.1,2.6 Hz, 1H), 7.35 (s,1H), 7.23 (d, J=8.9 Hz, 1H), 7.14 (d, J=11.3 Hz, 1H),4.29 (t, J=3.9 Hz,2H), 4.12 (p, J=6.6 Hz, 1H), 3.28 (d, J=17.2 Hz, 10H), 1.18 (d, J=6.4Hz, 6H).

Example-22 Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-2-isopropyl-1,2,3,4-tetrahydroisoquinolin-6-amine(Compound 22):

Step-1: Synthesis of tert-butyl6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinoline-2(1H)-carboxylate:o a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(200 mg, 0.61 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl6-amino-3,4-dihydroisoquinoline-2(1H)-carboxylate (168 mg, 0.67 mmol,1.1 equiv) and cesium carbonate (298 mg, 0.91 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (3 mg, 0.01 mmol, 0.02 equiv) andBINAP (15 mg, 0.02 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi-flash to obtain tert-butyl6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinoline-2(1H)-carboxylate(80 mg, 24%) as a yellow solid compound.

LCMS: 538.4[M+H]⁺

Step-2: Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-6-amine:A solution of tert-butyl6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinoline-2(1H)-carboxylate(30 mg, 0.05 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtainN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-6-amine(22 mg, 92%) as a brick red color solid compound.

LCMS: 439.4 [M+H]⁺

Step-3: Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-2-isopropyl-1,2,3,4-tetrahydroisoquinolin-6-amine:To a stirred solution ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-6-amine(50 mg, 0.1 mmol, 1 equiv) in DCE (5 mL), was added acetone (0.02 mL,0.3mmo1,3 equiv), acetic acid (0.03 mL, 0.5 mmol, 5 equiv). The reactionmixture was allowed to stir at RT for 1 h. The reaction mixture wascooled to 0° C. NaCNBH₃ (19 mg, 0.3 mmol, 3 equiv) was added to abovemixture and raise the temperature to RT. The reaction mixture wasallowed to stir at RT for 1 h. Progress of the reaction was monitored byLCMS. After completion of the reaction, the reaction mixture was dilutedwith water (25 mL) and extracted with ethyl acetate (50 mL×2). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to affordN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-2-isopropyl-1,2,3,4-tetrahydroisoquinolin-6-amine(10 mg, 20%) as a yellow solid compound.

LCMS: 480 [M+H]⁺

¹HNMR: (400 MHz, DMSO-d6) δ 9.57 (s, 1H), 8.55 (d, J=3.9 Hz, 1H), 7.49(d, J=7.4 Hz, 2H), 7.41(s, 1H), 7.16 (d, J=11.6 Hz, 1H), 6.96 (d, J=8.4Hz, 1H), 4.30 (t, J=4.3 Hz, 2H), 4.13 (p, J=6.5, 6.0 Hz, 1H), 3.58 (s,2H), 3.33-3.24 (m, 2H), 2.84 (p, J=6.5 Hz, 1H), 2.75 (t, J=5.7 Hz, 2H),2.67 (t, J=5.6 Hz, 2H), 1.18 (d, J=6.5 Hz, 6H), 1.05 (d, J=6.5 Hz, 6H).

Example-23 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-(piperazin-1-yl)pyridin-3-yl)pyrimidin-2-amine(Compound 23):

Step-1: Synthesis of tert-butyl4-(5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-2-yl)piperazine-1-carboxylate:o a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(5-aminopyridin-2-yl)piperazine-1-carboxylate (94 mg, 0.33 mmol, 1.1equiv) and cesium carbonate (147 mg, 0.45 mmol, 1.5 equiv). The reactionmixture was degassed with nitrogen gas for 30 min, followed by theaddition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP(8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to obtain tert-butyl4-(5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-2-yl)piperazine-1-carboxylate(50 mg, 29%) as a yellow solid compound.

LCMS: 568 [M+H]⁺

Step-2: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-(piperazin-1-yl)pyridin-3-yl)pyrimidin-2-amine:A solution of tert-butyl4-(5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-2-yl)piperazine-1-carboxylate(50 mg, 0.08 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-(piperazin-1-yl)pyridin-3-yl)pyrimidin-2-amine(40 mg, 91%) as a yellow solid compound.

LCMS: 468 [M+H]⁺

¹HNMR: (400 MHz, DMSO-d6) δ 9.67 (s, 1H), 9.14 (s, 1H), 8.57 (dd,J=9.2,3.3 Hz, 2H), 8.01 (d, J=9.2 Hz, 1H), 7.37 (s, 1H), 7.17-7.10 (m,1H), 7.07 (s, 1H), 4.29 (t, J=4.3 Hz, 2H), 4.11 (p, J=6.6 Hz,1H), 3.71(d, J=6.0 Hz, 4H), 3.30 (t, J=4.4 Hz, 2H), 3.21 (d, J=5.4 Hz, 4H), 1.17(d, J=6.5 Hz, 6H).

Example-24 Synthesis of 5-fluoro-N-(3-fluoro-4-(1-methylpiperidin-4-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(Compound 24):

Step-1: Synthesis of tert-butyl4-(2-fluoro-4-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(150 mg, 0.46 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(4-amino-2-fluorophenyl)piperidine-1-carboxylate (148 mg, 0.50 mmol,1.1 equiv) and cesium carbonate (225 mg, 0.69 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (3 mg, 0.009 mmol, 0.02 equiv) andBINAP (12 mg, 0.018 mmol, 0.04 equiv). The resultant reaction mixturewas allowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperidine-1-carboxylate(200 mg, 74%) as a yellow solid compound.

LCMS: 584[M+H]⁺

Step-2: Synthesis of 5-fluoro-N-(3-fluoro-4-(piperidin-4-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine: A solution of tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperidine-1-carboxylate(200 mg, 0.34 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain 5-fluoro-N-(3-fluoro-4-(piperidin-4-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(150 mg, 90%) as a yellow solid compound.

LCMS: 484 [M+H]⁺

Step-3: Synthesis of 5-fluoro-N-(3-fluoro-4-(1-methylpiperidin-4-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a stirred solution of 5-fluoro-N-(3-fluoro-4-(piperidin-4-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(100 mg, 0.2 mmol, 1 equiv) in DCE (5 mL), was added Formaldehyde (40%in water) (0.02 mL, 0.61 mmol, 3 equiv), acetic acid (0.05 mL, 1.0 mmol,5 equiv). The reaction mixture was allowed to stir at RT for 1 h. Thereaction mixture was cooled to 0° C. NaCNBH₃ (38 mg, 0.61 mmol, 3 equiv)was added to above mixture and raise the temperature to RT. The reactionmixture was allowed to stir at RT for 1 h. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, the reactionmixture was diluted with water (25 mL) and extracted with ethyl acetate(50 mL×2). Organic layer was washed with water (50 mL) and brinesolution (50 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by reverse phase HPLC to afford5-fluoro-N-(3-fluoro-4-(1-methylpiperidin-4-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(15 mg, 15%) as a yellow solid compound.

LCMS: 498 [M+H]⁺

¹HNMR: (400 MHz, DMSO-d6) δ 9.88 (s, 1H), 8.60 (d, J=3.9 Hz, 1H), 8.28(s, 1H), 7.75 (dd, J=13.7,2.2 Hz, 1H), 7.45 (s, 1H), 7.40 (dd, J=8.6,2.2 Hz, 1H), 7.24-7.13 (m, 2H), 4.30 (t, J=4.3 Hz, 2H),4.17 (p, J=6.5Hz, 1H), 3.31 (t, J=4.5 Hz, 2H), 2.87 (d, J=11.1 Hz, 2H), 2.40 (s, 1H),2.20 (s, 3H), 1.98 (td, J=10.9, 4.4 Hz, 2H), 1.69 (dd, J=12.0, 8.3 Hz,4H), 1.18 (d, J=6.5 Hz, 6H).

Example-25 Synthesis of N-(4-(4-(dimethylamino)piperidin-1-yl)-3-fluorophenyl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(Compound 25):

Step-1: Synthesis1-(2-fluoro-4-nitrophenyl)-N,N-dimethylpiperidin-4-amine: To a stirredsolution of 1,2-difluoro-4-nitrobenzene (400 mg, 2.5 mmol, 1 equiv) inDMSO (10 mL), was added DIPEA (1.7 mL, 10 mmol, 4 equiv) andN,N-dimethylpiperidin-4-amine (556 mg, 2.76 mmol, 1.1 equiv). Theresultant reaction mixture was allowed to stir at 100° for overnight.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the mixture was diluted with ice water (10 mL), solidobserved was filtered and dried under vacuum to obtain1-(2-fluoro-4-nitrophenyl)-N,N-dimethylpiperidin-4-amine (600 mg, 89%)as a yellow solid compound.

LCMS: 268 [M+H]⁺

Step-2: Synthesis of1-(4-amino-2-fluorophenyl)-N,N-dimethylpiperidin-4-amine: o a stirredsolution of 1-(2-fluoro-4-nitrophenyl)-N,N-dimethylpiperidin-4-amine(500 mg, 1.87 mmol, 1 equiv) in ethanol (8 mL), water (2 mL), was addediron powder (315 mg, 5.61 mmol, 3 equiv) and ammonium chloride (202 mg,3.74 mmol, 2 equiv). The resultant reaction mixture was allowed to stirat 90° for 1 h. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, the mixture was diluted with water (30mL) and extracted with EtoAc (100 mL). Organic layer was washed withwater (50 mL) and brine (50 mL). Organic layer was dried over anhydroussodium sulphate and concentrated under reduced pressure to obtain1-(4-amino-2-fluorophenyl)-N,N-dimethylpiperidin-4-amine (400 mg, 90%)as a dark brown solid compound.

LCMS: 238 [M+H]⁺

Step-3: Synthesis of N-(4-(4-(dimethylamino)piperidin-1-yl)-3-fluorophenyl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added1-(4-amino-2-fluorophenyl)-N,N-dimethylpiperidin-4-amine (78 mg, 0.33mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.45 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtainN-(4-(4-(dimethylamino)piperidin-1-yl)-3-fluorophenyl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(20 mg, 12%) as a yellow solid compound.

LCMS: 527 [M+H]⁺

¹HNMR: (400 MHz, DMSO-d6) δ 9.74 (s, 1H), 8.57 (d, J=4.0 Hz, 1H), 8.29(s, 1H), 7.72 (dd, J=15.3,2.5 Hz, 1H), 7.44 (s, 1H), 7.36 (dd, J=8.8,2.5 Hz, 1H), 7.16 (d, J=11.4 Hz, 1H), 6.97 (t, J=9.4 Hz,1H), 4.30 (t,J=4.4 Hz, 2H), 4.16 (p, J=6.6 Hz, 1H), 3.30 (dd, J=9.6, 5.2 Hz, 4H),2.63-2.54 (m, 2H), 2.22 (s, 7H), 1.84 (dd, J=12.7, 3.6 Hz, 2H), 1.54(tt, J=13.3, 6.7 Hz, 2H), 1.18 (d,J=6.5 Hz, 6H).

Example-26 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(3-fluoro-4-morpholinophenyl)pyrimidin-2-amine(Compound 26):

Step-1: Synthesis 4-(2-fluoro-4-nitrophenyl) morpholine:

To a stirred solution of morpholine (2.5 mL, 28 mmol, 4.5 equiv) in THF(15 mL), was added 1, 2-difluoro-4-nitrobenzene (1000 mg, 6.28 mmol, 1equiv) at 0° C. Raise the temp to RT and the mixture was allowed to stirfor 2h at RT. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, the mixture was diluted with water(100 mL) and extracted with EtoAc (200 mL). Organic layer was washedwith water (50 mL) and brine (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain 4-(2-fluoro-4-nitrophenyl) morpholine (1000 mg, 70%) as a yellowsolid compound.

LCMS: 227 [M+H]⁺

Step-2: Synthesis of 3-fluoro-4-morpholinoaniline:

To a stirred solution of 4-(2-fluoro-4-nitrophenyl) morpholine (400 mg,1.76 mmol, 1 equiv) in ethanol (8 mL), water (2 mL), was added ironpowder (297 mg, 5.3 mmol, 3 equiv) and ammonium chloride (190 mg, 3.52mmol, 2 equiv). The resultant reaction mixture was allowed to stir at90° for 1 h. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, the mixture was diluted with water (30mL) and extracted with EtoAc (100 mL). Organic layer was washed withwater (50 mL) and brine (50 mL). Organic layer was dried over anhydroussodium sulphate and concentrated under reduced pressure to obtain crude,which was purified by normal phase combi flash to obtain3-fluoro-4-morpholinoaniline (240 mg, 69%) as a dark brown solidcompound.

LCMS: 197 [M+H]⁺

Step-3: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(3-fluoro-4-morpholinophenyl)pyrimidin-2-amine:

To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added3-fluoro-4-morpholinoaniline (66 mg, 0.33 mmol, 1.1 equiv) and cesiumcarbonate (147 mg, 0.45 mmol, 1.5 equiv). The reaction mixture wasdegassed with nitrogen gas for 30 min, followed by the addition ofpalladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP (8 mg, 0.012mmol, 0.04 equiv). The resultant reaction mixture was allowed to stir at100° C. for 16 h. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, diluted with water (30 mL) andextracted with ethyl acetate (100 mL). Organic layer was washed withwater (50 mL) and brine solution (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by reverse phase HPLC to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(3-fluoro-4-morpholinophenyl)pyrimidin-2-amine(20 mg, 13%) as a yellow solid compound.

LCMS: 486 [M+H]⁺

¹HNMR: (400 MHz, DMSO-d6) δ 9.75 (s, 1H), 8.56 (d, J=3.9 Hz, 1H), 7.75(dd, J=15.5, 2.5 Hz, 1H),7.43 (s, 1H), 7.41-7.35 (m, 1H), 7.20-7.12 (m,1H), 6.98 (t, J=9.4 Hz, 1H), 4.30 (t, J=4.2 Hz, 2H),4.15 (p, J=7.7, 7.1Hz, 1H), 3.74 (t, J=4.6 Hz, 4H), 3.30 (d, J=4.5 Hz, 2H), 2.94 (t, J=4.6Hz, 4H), 1.18 (d, J=6.5 Hz, 6H).

Example-27 Synthesis of 5-fluoro-N-(3-fluoro-4-(4-(pyrrolidin-1-yl)piperidin-1-yl)phenyl)-6-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyridin-2-amine(Compound 27):

Step-1: Synthesis of 1-(2-fluoro-4-nitrophenyl) piperidin-4-one:

To a stirred solution of 1,2-difluoro-4-nitrobenzene (3000 mg, 18.8mmol, 1 equiv) in ACN (30 mL), was added DIPEA (6.6 mL, 37.6 mmol, 2equiv) and piperidin-4-one (2906 mg, 18.8 mmol, 1 equiv). The resultantreaction mixture was allowed to stir at 80° for overnight. Progress ofthe reaction was monitored by TLC and LCMS. After completion of thereaction, the mixture was diluted with EtoAc (200 mL), washed with 10%HCl (100 mL) and brine (100 mL). Organic layer was dried over anhydroussodium sulphate and concentrated under reduced pressure to obtain1-(2-fluoro-4-nitrophenyl) piperidin-4-one (4200 mg, 94%) as a yellowsolid compound.

LCMS: 239 [M+H]⁺

Step-2: Synthesis 1-(2-fluoro-4-nitrophenyl)-4-(pyrrolidin-1-yl)piperidine: To a stirred solution of 1-(2-fluoro-4-nitrophenyl)piperidin-4-one (2000 mg, 8.4 mmol, 1 equiv) in THF (20 mL), was addedpyrrolidine (1 mL, 11.76 mmol, 1.4 equiv), sodium acetate (1033 mg, 12.6mmol, 1.5 equiv), and acetic acid (1 mL). The resultant reaction mixturewas allowed to stir at RT for 1 h. Sodium borohydride (570 mg, 15 mmol,1.5 equiv) was added to above mixture and the resultant reaction mixturewas allowed to stir at RT for overnight. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, the mixture wasdiluted with water (100 mL) and extracted with EtoAc (100 mL x2).Organic layer was washed with water (100 mL) and brine (100 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain1-(2-fluoro-4-nitrophenyl)-4-(pyrrolidin-1-yl) piperidine (2000 mg, 81%)as a yellow solid compound.

LCMS: 294 [M+H]⁺

Step-3: Synthesis of 3-fluoro-4-(4-(pyrrolidin-1-yl) piperidin-1-yl)aniline:

To a stirred solution of 1-(2-fluoro-4-nitrophenyl)-4-(pyrrolidin-1-yl)piperidine (1000 mg, 3.4 mmol, 1 equiv) in ethanol (10 mL), water (3mL), was added iron powder (573 mg, 10.2 mmol, 3 equiv) and ammoniumchloride (367 mg, 6.8 mmol, 2 equiv). The resultant reaction mixture wasallowed to stir at 90° for 1 h. Progress of the reaction was monitoredby TLC and LCMS. After completion of the reaction, the mixture wasdiluted with water (50 mL) and extracted with EtoAc (100 mL×2). Organiclayer was washed with water (50 mL) and brine (50 mL). Organic layer wasdried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain 3-fluoro-4-(4-(pyrrolidin-1-yl) piperidin-1-yl)aniline (700 mg, 78%) as a dark brown solid compound.

LCMS: 264 [M+H]⁺

Step-4: Synthesis 5-fluoro-N-(3-fluoro-4-(4-(pyrrolidin-1-yl)piperidin-1-yl)phenyl)-6-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyridin-2-amine:

To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added3-fluoro-4-(4-(pyrrolidin-1-yl) piperidin-1-yl) aniline (87 mg, 0.33mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.45 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtain5-fluoro-N-(3-fluoro-4-(4-(pyrrolidin-1-yl)piperidin-1-yl)phenyl)-6-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyridin-2-amine(40 mg, 24%) as a yellow solid compound.

LCMS: 553.5 [M+H]⁺

¹HNMR: (400 MHz, DMSO-d6) δ 9.71 (s, 1H), 8.56 (d, J=4.0 Hz, 1H), 7.71(d, J=15.3 Hz, 1H), 7.44 (s, 1H), 7.36 (d, J=8.9 Hz, 1H), 7.16 (d,J=11.6 Hz, 1H), 6.97 (t, J=9.4 Hz, 1H), 4.33-4.26 (m, 2H), 4.15 (dq,J=14.0, 7.5, 6.9 Hz, 1H), 3.33-3.21 (m, 3H), 2.65 (s, 3H), 2.56 (d,J=5.1 Hz,4H), 2.12 (d, J=10.6 Hz, 1H), 1.98-1.90 (m, 2H), 1.69 (t, J=5.1Hz, 4H), 1.56 (q, J=10.8, 9.4 Hz,2H),1.18 (d, J=6.4 Hz, 6H).

Example-28 Synthesis of N-(2,3-difluoro-4-(piperazin-1-yl)phenyl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(Compound 28):

Step-1: Synthesis tert-butyl4-(2,3-difluoro-4-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate:

To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(4-amino-2,3-difluorophenyl)piperazine-1-carboxylate (103 mg, 0.33mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.45 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtain tert-butyl4-(2,3-difluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate(90 mg, 48%) as a yellow color solid compound.

LCMS: 603 [M+H]⁺

Step-2: Synthesis of N-(2,3-difluoro-4-(piperazin-1-yl)phenyl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:

A solution of obtain tert-butyl4-(2,3-difluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate(90 mg, 0.14 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain N-(2,3-difluoro-4-(piperazin-1-yl)phenyl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(60 mg, 75%) as a brown color solid compound.

LCMS: 503 [M+H]⁺

¹HNMR: (400 MHz, DMSO-d6) δ 9.35 (s, 1H), 8.88 (d, J=19.7 Hz, 1H), 8.51(d, J=3.9 Hz, 1H), 7.33(d, J=7.0 Hz, 2H), 7.10 (d, J=11.7 Hz, 1H), 6.90(t, J=8.9 Hz, 1H), 4.31-4.23 (m, 2H), 4.03 (p, J=6.8 Hz, 1H), 3.26 (q,J=6.4, 5.7 Hz, 10H), 1.15 (d, J=6.4 Hz, 6H).

Example-29 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(3-methoxy-4-(piperazin-1-yl)phenyl)pyrimidin-2-amine(Compound 29):

Step-1: Synthesis tert-butyl 4-(2-methoxy-4-nitrophenyl)piperazine-1-carboxylate:

To a stirred solution of 1-fluoro-2-methoxy-4-nitrobenzene (1000 mg, 5.8mmol, 1 equiv) in NMP (15 mL), was added K₂CO₃ (1601 mg, 11.6 mmol, 2equiv) and tert-butyl piperazine-1-carboxylate (1632 mg, 8.77 mmol,1.5equiv). The resultant reaction mixture was allowed to stir at 100° C.for 3 h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the mixture was diluted with water (50 mL)and extracted with EtOAc (100 mL×2). Organic layer was washed with water(50 mL) and brine (50 mL). Organic layer was dried over anhydrous sodiumsulphate and concentrated under reduced pressure to obtain tert-butyl4-(2-methoxy-4-nitrophenyl) piperazine-1-carboxylate (1200 mg, 61%) as adark brown solid compound.

LCMS: 338 [M+H]⁺

Step-2: Synthesis of tert-butyl 4-(4-amino-2-methoxyphenyl)piperazine-1-carboxylate:

To a stirred solution of tert-butyl 4-(2-methoxy-4-nitrophenyl)piperazine-1-carboxylate (400 mg, 1.18 mmol, 1 equiv) in ethanol (8 mL),water (2 mL), was added iron powder (297 mg, 3.56 mmol, 3 equiv) andammonium chloride (190 mg, 2.36 mmol, 2 equiv). The resultant reactionmixture was allowed to stir at 90° for 1 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, the mixturewas diluted with water (30 mL) and extracted with EtoAc (100 mL).Organic layer was washed with water (50 mL) and brine (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to obtain tert-butyl4-(4-amino-2-methoxyphenyl)piperazine-1-carboxylate (250 mg, 69%) as adark brown solid compound.

LCMS: 308 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-methoxyphenyl)piperazine-1-carboxylate:

To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(4-amino-2-methoxyphenyl)piperazine-1-carboxylate (101 mg, 0.33 mmol,1.1 equiv) and cesium carbonate (147 mg, 0.45 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtain tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-methoxyphenyl)piperazine-1-carboxylate(40 mg, 22%) as a yellow color solid compound.

LCMS: 597 [M+H]⁺

Step-4: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(3-methoxy-4-(piperazin-1-yl)phenyl)pyrimidin-2-amine:

A solution of obtain tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-methoxyphenyl)piperazine-1-carboxylate(40 mg, 0.06 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(3-methoxy-4-(piperazin-1-yl)phenyl)pyrimidin-2-amine(20 mg, 56%) as a brown color solid compound.

LCMS: 497 [M+H]⁺

¹HNMR : (400 MHz, DMSO-d6) δ 9.59 (s, 1H), 9.00 (d, J=5.7 Hz, 1H), 8.55(d, J=3.8 Hz, 1H), 7.46(d, J=2.3 Hz, 1H), 7.39 (s, 1H), 7.37-7.25 (m,1H), 7.19 (d, J=11.4 Hz, 1H), 6.88 (d, J=8.6 Hz, 1H),4.34-4.25 (m, 2H),4.12 (p, J=6.3 Hz, 1H), 3.79 (s, 4H), 3.34-3.27 (m, 2H), 3.27-3.17 (m,4H), 3.13 (t, J=4.6 Hz, 3H), 1.18 (d, J=6.4 Hz, 6H).

Example-30 Synthesis of 5-chloro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(Compound 30):

Step-1: Synthesis of6-(2,5-dichloropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine:

To a stirred solution of 2,4,5-trichloropyrimidine (300 mg, 1.64 mmol, 1equiv) in THF: Water (1:1=10 mL) was added,8-fluoro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(529 mg, 1.64 mmol, 1 equiv), Potassium carbonate (453 mg, 3.28 mmol, 2equiv) and Pd(PPh3)4 (95 mg, 0.08 mmol, 0.05 equiv). The reactionmixture was allowed to stir at 80° C. for 4 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL×2). Organic layer was washed with water (100 mL) andbrine solution (100 mL). Organic layer was dried over anhydrous sodiumsulphate and concentrated under reduced pressure to obtain crudecompound, which was purified by normal phase combi-flash to obtain6-(2,5-dichloropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(350 mg, 62%) as a yellow solid.

LCMS: 342 [M+H]⁺

Step-2: Synthesis tert-butyl4-(4-((5-chloro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-fluorophenyl)piperazine-1-carboxylate:

To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(4-amino-2,3-difluorophenyl)piperazine-1-carboxylate (103 mg, 0.33mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.45 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to tert-butyl4-(4-((5-chloro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-fluorophenyl)piperazine-1-carboxylate(70 mg, 40%) a yellow color solid compound.

LCMS: 601 [M+H]⁺

Step-3: Synthesis of 5-chloro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:

A solution of obtain tert-butyl4-(4-((5-chloro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-fluorophenyl)piperazine-1-carboxylate(70 mg, 0.11 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 hat 50° C. Progress of the reaction was monitored by LCMS.After completion of the reaction, solvent was removed under reducedpressure to obtain 5-chloro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(50 mg, 79%) as a brick red color solid compound.

LCMS: 501 [M+H]⁺

¹HNMR: (400 MHz, DMSO-d6) δ 9.97 (s, 1H), 9.10 (s, 1H), 8.58 (s, 1H),7.78 (dd, J=15.2, 2.5 Hz,1H), 7.41 (dd, J=8.8, 2.3 Hz, 1H), 7.13 (s,1H), 7.04 (t, J=9.4 Hz, 1H), 6.99 (d, J=11.2 Hz, 1H), 4.32-4.25 (m, 2H),4.09 (s, 1H), 3.34-3.27 (m, 2H), 3.27-3.19 (m, 4H), 3.16 (dd, J=6.9, 3.4Hz, 4H), 1.17(d, J=6.5 Hz, 6H).

Example-31 Synthesis ofN-(2,5-difluoro-4-(piperazin-1-yl)phenyl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(Compound 31):

Step-1: Synthesis of tert-butyl4-(2,5-difluoro-4-nitrophenyl)piperazine-1-carboxylate:

To a solution of 1,2,4-trifluoro-5-nitrobenzene (500 mg, 2.85 mmol, 1equiv) and K₂CO₃ (432 mg, 3.13 mmol, 1.1 equiv) in DMF (10 mL), wasadded a solution of tert-butyl piperazine-1-carboxylate (526 mg, 2.85mmol, 1 equiv) in DMF (5 mL) at 0° C. . The resultant reaction mixturewas allowed to stir at 0° C. for 15 min. followed by RT overnight.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, precipitated salt removed by filtration and filtratediluted with ethyl acetate (50 mL). Organic layer was washed with coldwater (30 mL×3) and brine solution (30 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain tert-butyl 4-(2,5-difluoro-4-nitrophenyl)piperazine-1-carboxylate(950 mg, 97.3%) as a yellow color solid compound.

LCMS: 344.2 [M+H]⁺

Step-2: Synthesis of tert-butyl4-(4-amino-2,5-difluorophenyl)piperazine-1-carboxylate:

To a solution of tert-butyl4-(2,5-difluoro-4-nitrophenyl)piperazine-1-carboxylate (200 mg, 0.538mmol, 1 equiv) in Ethanol : Water (1:1) (20 mL), was added NH₄Cl (63 mg,1.66 mmol, 2 equiv) and Fe dust (98 mg, 1.166 mmol, 3 equiv) at RT . Theresultant reaction mixture was allowed to reflux at 90° C. for 3h.Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, reaction mixture filtered through celite bedand filtrate concentrated up to dry. Residue obtained dissolved in EtOAc(50 mL) and organic layer washed with water (30 mL) and brine solution(30 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude, which was purifiedby column chromatography (eluted in 20% EtOAc in Hexane) to obtainedtert-butyl 4-(4-amino-2,5-difluorophenyl)piperazine-1-carboxylate (130mg, 71.4%) as a brown color solid compound.

LCMS: 314.4 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(2,5-difluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate::

To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.31 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(4-amino-2,5-difluorophenyl)piperazine-1-carboxylate (106 mg, 0.34mmol, 1.1 equiv) and cesium carbonate (150 mg, 0.46 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to tert-butyl4-(2,5-difluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate(50 mg, 27%) as a yellow color solid compound.

LCMS: 603.5 [M+H]⁺

Step-4: Synthesis ofN-(2,5-difluoro-4-(piperazin-1-yl)phenyl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:

A solution of tert-butyl4-(2,5-difluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate(50 mg, 0.083 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtainN-(2,5-difluoro-4-(piperazin-1-yl)phenyl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(30 mg, 72.11%) as a red color solid compound.

LCMS: 503.4 [M+H]⁺

¹HNMR: (400 MHz, DMSO-d6) δ 9.24 (br. s, 2H), 8.53 (d, J=3.51 Hz, 1H),7.68 (dd, J=7.45, 13.59 Hz, 1H), 7.36 (s, 1H), 6.98-7.20 (m, 2H), 4.26(br. s, 2H), 4.04 (br. s, 1H), 3.22 (d, J=7.89 Hz, 10H), 1.09-1.25 (m,6H).

Example-32 Synthesis of5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-2-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(Compound 32):

Step-1: Synthesis of 2-amino-4-bromo-6-fluorophenol:

To a stirred suspension of 4-bromo-2-fluoro-6-nitrophenol (15 g, 63.55mmol, 1 equiv) in ethanol (400 mL), was added stannous chloridemonohydrate (60 g, 317.8 mmol, 5 equiv) at room temperature . Thereaction mixture was refluxed at 80° C. for 3 h. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, reaction mass concentrated, the reaction poured on ice-coldwater (500 mL) and was basified by 3N NaOH solution up to pH 10 and wasextracted with ethyl acetate (350 mL×3), organic layer was washed withwater (150 mL) and brine solution (150 mL). Organic layer dried overanhydrous sodium sulphate and concentrated under reduced pressure toafford 2-amino-4-bromo-6-fluorophenol (11 g). LCMS: 207 [M+H]hu +, 209[M+2H]⁺

Step-2: Synthesis of 4-bromo-2-fluoro-6-(isopropylamino)phenol:

To a stirred solution of 2-amino-4-bromo-6-fluorophenol (500 mg, 2.4mmol, 1 equiv) in 1,2 dichloroethane (10 mL), was added acetone (211.1mg, 4.8 mmol, 2 equiv) followed by addition of acetic acid (540 mg, 12mmol, 5 equiv) at 0° C. The reaction mixture was stirred at roomtemperature for 30 minutes. To this was added sodiumtriacetoxyborohydride (1010 mg, 4.8 mmol, 2 equiv) at 0° C. Resultantmixture was stirred at room temperature for 16 h. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, the reaction mixture was quenched with water (40 mL) and wasextracted with ethyl acetate (40 mL×2). The combined organic layer waswashed with water (15 mL) and brine solution (15 mL). Organic layer wasdried over anhydrous sodium sulphate and concentrated under reducedpressure to afford 4-bromo-2-fluoro-6-(isopropylamino)phenol (480 mg).

LCMS: 248 [M+H]⁺, 250 [M+2H]⁺

Step-3: Synthesis of6-bromo-8-fluoro-4-isopropyl-2-methyl-2H-benzo[b][1,4]oxazin-3(4H)-one:

To a stirred solution of 4-bromo-2-fluoro-6-(isopropylamino)phenol (2 g,8.1 mmol, 1 equiv) in chloroform (40 mL), was added NaHCO₃ (3.4 g, 40.5mmol, 5 equiv) at 0° C, followed by addition of benzyl triethyl ammoniumchloride (1.84 g, 8.1 mmol, 1 equiv) at 0° C. The reaction mixture wasstirred at 0° C. for 5 min. To this was added 2-chloropropanoyl chloride(1.02 g, 8.1 mmol, 1 equiv) at 0° C. Resultant mixture was stirred at 0°C. for 1 h and then at 60° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was quenched with saturated Na2CO3 solution (100 mL)and was extracted with DCM (100 mL×2). The combined organic layer waswashed with water (15 mL) and brine solution (15 mL). Organic layer wasdried over anhydrous sodium sulphate and concentrated under reducedpressure to afford6-bromo-8-fluoro-4-isopropyl-2-methyl-2H-benzo[b][1,4]oxazin-3(4H)-one(1.5 g).

LCMS: 302 [M+H]⁺, 304 [M+2H]⁺

Step-4: Synthesis of6-bromo-8-fluoro-4-isopropyl-2-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazine:

To a stirred solution of6-bromo-8-fluoro-4-isopropyl-2-methyl-2H-benzo[b][1,4]oxazin-3(4H)-one(1000 mg, 3.32 mmol, 1 equiv) in THF (14 mL), was drop wise addedBH₃.DMS (1 mL, 13.3 mmol, 4 equiv) at 0° C. The reaction mixture wasstirred at 50° C. for 16 h. Progress of the reaction was monitored byTLC and LCMS. After completion of the reaction, the reaction mixture wasquenched with water (50 mL) and extracted with ethyl acetate (100 mL×3).The combined organic layer was washed with water (50 mL) and brinesolution (50 mL). Organic layer dried over anhydrous sodium sulphate andconcentrated under reduced pressure to afford6-bromo-8-fluoro-4-isopropyl-2-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(700 mg).

LCMS: 288 [M+H]⁺, 290 [M+2H]⁺

Step-5: Synthesis of8-fluoro-4-isopropyl-2-methyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine:To a stirred solution of6-bromo-8-fluoro-4-isopropyl-2-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(200 mg, 0.7 mmol, 1 equiv) in dioxane (4 mL), was added4,4,5,5-tetramethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,2-dioxaborolane(194 mg, 0.76 mmol, 1.1 equiv) and potassium acetate (100 mg, 1.05 mmol,1.5 equiv). Aerated the reaction mixture with nitrogen gas for 15minutes. After addition of PdCl2(dppf) DCM (24 mg, 0.034 mmol, 0.05equiv) again purge nitrogen for 5 min. The reaction mixture was stirredat 100° C. for 4 h. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, the reaction mixture was dilutedwith water (30 mL) and extracted with ethyl acetate (20 mL×2), organiclayer was washed with brine (20 mL). The organic layer dried overanhydrous sodium sulphate and concentrated under reduced pressurepurified by combiflash to afford8-fluoro-4-isopropyl-2-methyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(170 mg).

LCMS: 336 [M+H]⁺

Step-6: Synthesis of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-2-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazine:

To a stirred solution of 2,4-dichloro-5-fluoropyrimidine (0.75 g, 4.5mmol, 1 equiv) and8-fluoro-4-isopropyl-2-methyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(1.5 g, 4.5 mmol, 1 equiv) in THF: Water (1:1,20 mL) was added potassiumcarbonate (0.93 g, 6.75 mmol, 1.5 equiv) and Pd(PPh3)4 (0.259 g, 0.226mmol, 0.05 equiv). The reaction mixture was heated to 80° C. for 4 h.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the reaction mixture was diluted with water (30 mL) andextracted with ethyl acetate (100 mL×2), organic layer was washed withwater (100 mL) and brine solution (100 mL). The organic layer dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude compound, which was purified by normal phase combi-flash toafford6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-2-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(0.8 g) as a yellow solid compound.

LCMS: 340 [M+H]⁺

Step-7: Synthesis of tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-2-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate:

To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-2-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(60 mg, 0.18 mmol, 1 equiv) in Dioxane (3 mL), was added tert-butyl4-(4-amino-2-fluorophenyl)piperazine-1-carboxylate (57 mg, 0.19 mmol,1.1 equiv) and cesium carbonate (88 mg, 0.27 mmol, 1.5 equiv). Thereaction mixture was aerated with nitrogen gas for 10 min. followed bythe addition of palladium acetate (4 mg, 0.02 mmol, 0.1 equiv) and BINAP(22 mg, 0.036 mmol, 0.2 equiv) again purged nitrogen for 5 min. Theresultant reaction mixture was stirred at 100° C. for 16 h. Progress ofthe reaction was monitored by TLC and LCMS. After completion of thereaction, the reaction mixture was diluted with water (10 mL) andextracted with EtOAc (15 mL). The organic layer dried over anhydroussodium sulphate and concentrated under reduced pressure to obtain crudecompound, which was purified by reverse phase HPLC to afford oftert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-2-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate(50 mg).

LCMS: 599 [M+H]⁺

Step-8: Synthesis of5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-2-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:

Tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-2-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate(50 mg, 0.083 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (4 mL)and the resultant reaction mixture was stirred at 50° C. for 2 h.Progress of the reaction was monitored by LCMS. After completion of thereaction, the reaction mixture was concentrated under vacuum to obtain5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-2-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(20 mg) as a HCl salt.

LCMS: 499 [M+H]⁺

¹HNMR: (400 MHz, DMSO-d6) δ 9.82 (s, 1H), 9.03 (d, J=8.5 Hz, 2H), 8.58(d,J=3.9 Hz, 1H), 7.81(dd, J=15.3, 2.4 Hz, 1H), 7.41 (d, J=9.2 Hz, 2H),7.16 (d, J=11.7 Hz, 1H), 7.05 (t, J=9.4 Hz, 1H),4.29 (p, J=7.5 Hz, 1H),4.16 (p, J=6.7 Hz, 1H), 3.45 (d, J=12.2 Hz, 1H), 3.27-3.21 (m, 4H), 3.16(t, J=4.7 Hz, 4H), 2.88 (dd, J=12.7, 7.5 Hz, 1H), 1.36 (d, J=6.2 Hz,3H), 1.21 (d, J=6.7 Hz, 3H), 1.15 (d, J=6.5 Hz, 3H).

Example-33 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-(1-methylpiperidin-4-yl)pyridin-3-yl)pyrimidin-2-amine(Compound 33):

Step-1: Synthesis of tert-butyl5-amino-3′,6′-dihydro-[2,4′-bipyridine]-1′(2′H)-carboxylate: To asolution of 6-bromopyridin-3-amine (1000 mg, 5.8 mmol, 1 equiv) indioxane (15 mL), was added tert-butyl4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydropyridine-1(2H)-carboxylate(1797 mg, 5.8 mmol, 1 equiv) and sodium carbonate (1844 mg, 17.4 mmol, 3equiv). The reaction mixture was degassed with nitrogen gas for 30 min,followed by the addition of Pd(PPh₃)₂Cl₂ (204 mg, 0.29 mmol, 0.05equiv). The resultant reaction mixture was allowed to stir at 100° C.for overnight. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, reaction mixture was diluted withwater (30 mL) and extracted with ethyl acetate (100 mL×2). Organic layerwas washed with water (100 mL) and brine solution (100 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to tert-butyl5-amino-3′,6′-dihydro-[2,4′-bipyridine]-1′(2′H)-carboxylate (900 mg,56%) as a yellow oil compound.

LCMS: 276 [M+H]⁺

Step-2: Synthesis of tert-butyl 4-(5-aminopyridin-2-yl)piperidine-1-carboxylate: To a stirred solution of tert-butyl5-amino-3′, 6′-dihydro-[2,4′-bipyridine]-1′(2′H)-carboxylate (900 mg,3.2 mmol, 1 equiv) in methanol (10 mL), was added Pd/C (20% w/w) (180mg) under H₂ atm. The resultant reaction mixture was allowed to stir atRT for overnight. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, the mixture was passes through celite bedand the filtrate was concentrated under reduced pressure to obtaintert-butyl 4-(5-aminopyridin-2-yl) piperidine-1-carboxylate (800 mg,88%) as a transparent oil compound.

LCMS: 278 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)227yridine-2-yl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(150 mg, 0.46 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(5-aminopyridin-2-yl) piperidine-1-carboxylate (141 mg, 0.50 mmol, 1.1equiv) and cesium carbonate (225 mg, 0.69 mmol, 1.5 equiv). The reactionmixture was degassed with nitrogen gas for 30 min, followed by theaddition of palladium acetate (2 mg, 0.009 mmol, 0.02 equiv) and BINAP(12 mg, 0.018 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to obtain tert-butyl4-(5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-2-yl)piperidine-1-carboxylate(60 mg, 23%) as a yellow solid compound.

LCMS: 567 [M+H]⁺

Step-4: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-(piperidin-4-yl)pyridin-3-yl)pyrimidin-2-amine:A solution of tert-butyl4-(5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-2-yl)piperidine-1-carboxylate(60 mg, 0.1 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-(piperidin-4-yl)pyridin-3-yl)pyrimidin-2-amine(50 mg, 94%) as a yellow solid compound.

LCMS: 467 [M+H]⁺

Step-5: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-(1-methylpiperidin-4-yl)pyridin-3-yl)pyrimidin-2-amine:To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-(piperidin-4-yl)pyridin-3-yl)pyrimidin-2-amine(50 mg, 0.09 mmol, 1 equiv) in DCE (5 mL), was added Formaldehyde (40%in water) (0.01 mL, 0.29 mmol, 3 equiv), acetic acid (0.02 mL, 0.45mmol, 5 equiv). The reaction mixture was allowed to stir at RT for 1 h.The reaction mixture was cooled to 0° C. NaCNBH₃ (18 mg, 0.29 mmol, 3equiv) was added to above mixture and raise the temperature to RT. Thereaction mixture was allowed to stir at RT for overnight. Progress ofthe reaction was monitored by LCMS. After completion of the reaction,the reaction mixture was diluted with water (25 mL) and extracted withethyl acetate (50 mL×2). Organic layer was washed with water (50 mL) andbrine solution (50 mL). Organic layer was dried over anhydrous sodiumsulphate and concentrated under reduced pressure to obtain crude, whichwas purified by reverse phase HPLC to afford5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-(1-methylpiperidin-4-yl)pyridin-3-yl)pyrimidin-2-amine(7 mg, 15%) as a yellow color solid compound.

LCMS: 481 [M+H]⁺

¹HNMR: (400 MHz ,DMSO-d₆) δ 9.79 (s, 1H), 8.84 (br. s, 1H), 8.57 (d,J=3.9 Hz, 1H), 8.05 (d, J=6.1 Hz, 1H), 7.44 (br. s, 1H), 7.27-7.01 (m,2H), 4.30 (br. s, 2H), 4.17-4.02 (m, 1H), 3.30 (br. s, 3H), 2.88 (d,J=11.0 Hz, 2H), 2.21 (s, 3H), 2.00 (br. s, 2H), 1.88-1.59 (m, 4H), 1.19(d, J=6.6 Hz, 6H).

Example-34 Synthesis of 5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(Compound 34):

Step-1: Synthesis of6-bromo-8-fluoro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-o6-bromo-8-fluoro-4-methyl-2H-benzo[b][1,4]oxazin-3(4H)-onene:To a stirred solution of6-bromo-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one (700 mg, 2.85 mmol, 1equiv) in DMF (10 mL), was added K₂CO₃ (789 mg, 5.71 mmol, 2 equiv) andmethyl iodide (0.4 mL, 5.71 mmol, 2 equiv). The reaction mixture wasallowed to stir at 80° C. for 3 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (50 mL), solid observed wasfiltered dried under vacuum to obtain6-bromo-8-fluoro-4-methyl-2H-benzo[b][1,4]oxazin-3(4H)-one (700 mg, 95%)as an off white solid compound.

LCMS: 260 [M+H]⁺

Step-2: Synthesis of6-bromo-8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazine: To astirred solution of6-bromo-8-fluoro-4-methyl-2H-benzo[b][1,4]oxazin-3(4H)-one (700 mg, 2.7mmol, 1 equiv) in THF (15 mL), was added BH₃.DMS (1 mL, 10.8 mmol, 4equiv) at 0° C. drop wise. The reaction mixture was allowed to stir at80° C. for overnight. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, the reaction mixture wasquenched with saturated solution of NaHCO₃ (100 mL) and extracted withethyl acetate (100 mL×2). Organic layer was washed with water (100 mL),dried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain6-bromo-8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazine (650 mg,98%) as a yellow viscous compound.

LCMS: 246 [M+H]⁺

Step-3; Synthesis of8-fluoro-4-methyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine:6-bromo-8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazine (650 mg,2.65 mmol, 1 equiv),4,4,5,5-tetramethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,2-dioxaborolane(809 mg, 3.18 mmol, 1.2 equiv), Potassium acetate (779 mg, 7.95 mmol, 3equiv) and dioxane (10 mL) were charged in a 25 mL glass bottle. Purgedthe reaction mixture with nitrogen gas for 15 min, Pd(dppf)Cl2. DCM (108mg, 0.13 mmol, 0.05 equiv) was added to above mixture and the reactionmixture was allowed to stir at 100° C. for 3 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL×2). Organic layer was washed with brine (50 mL) andwater (50 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain8-fluoro-4-methyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(700 mg, 90%) as a dark brown viscous compound.

LCMS: 294 [M+H]⁺

Step-4: Synthesis of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazine:To a stirred solution of 2,4-dichloro-5-fluoropyrimidine (400 mg, 2.19mmol, 1 equiv) in THF: Water (5 mL: 5 mL) was added8-fluoro-4-methyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(642 mg, 2.19 mmol, 1 equiv), Potassium carbonate (607 mg, 4.39 mmol, 2equiv) and Pd(PPh₃)₄ (127 mg, 0.1 mmol, 0.05 equiv). The reactionmixture was allowed to stir at 80° C. for 3 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL×2). Organic layer was washed with water (100 mL) andbrine (100 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude compound, whichwas purified by normal phase combi-flash to obtain6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(360 mg, 55%) as a yellow solid compound.

LCMS: 298 [M+H]⁺

Step-5: Synthesis of tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.33 mmol, 1 equiv) in Dioxane (10 mL), was added tert-butyl4-(4-amino-2-fluorophenyl)piperazine-1-carboxylate (109 mg, 0.37 mmol,1.1 equiv) and cesium carbonate (161 mg, 0.49 mmol, 1.5 equiv). Thereaction mixture was purged with nitrogen gas for 30 min, followed bythe addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.013 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brine(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound, which waspurified by reverse phase HPLC to obtain tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate(70 mg, 70%) as a yellow solid compound.

LCMS: 557[M+H]⁺

Step-6: Synthesis of 5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate(70 mg, 0.12 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure and the residuewas dried under lyophilizer to obtain5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(45 mg, 73%) as a brick red color solid compound.

LCMS: 457[M+H]⁺

¹HNMR: (400 MHz, DMSO-d6) δ 9.83 (s, 1H), 9.33 (s, 1H), 8.58 (d, J=3.9Hz, 1H), 7.86 (dd, J=15.5,2.5 Hz, 1H), 7.42-7.34 (m, 1H), 7.30 (s, 1H),7.26-7.17 (m, 1H), 7.06 (t, J=9.4 Hz, 1H), 4.37 (t, J=4.3 Hz, 2H), 3.37(t, J=4.3 Hz, 2H), 3.26-3.14 (m, 8H), 2.96 (s, 3H).

Example-35 Synthesis of4-(4-ethyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)pyrimidin-2-amine(Compound 35):

Step-1: Synthesis of6-6-bromo-4-ethyl-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one: To astirred solution of 6-bromo-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one(700 mg, 2.85 mmol, 1 equiv) in DMF (10 mL), was added K₂CO₃ (789 mg,5.71 mmol, 2 equiv) and ethyl iodide (0.5 mL, 5.71 mmol, 2 equiv). Thereaction mixture was allowed to stir at 80° C. for 3 h. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, the reaction mixture was diluted with water (50 mL), solidobserved was filtered dried under vacuum to obtain6-bromo-4-ethyl-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one (700 mg, 90%)as an off white solid compound.

LCMS: 274 [M+H]⁺

Step-2: Synthesis of6-bromo-4-ethyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine: To astirred solution of6-bromo-4-ethyl-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one (700 mg, 2.7mmol, 1 equiv) in THF (10 mL), was added BH₃.DMS (1 mL, 10.8 mmol, 4equiv) at 0° C. drop wise. The reaction mixture was allowed to stir at80° C. for overnight. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, the reaction mixture wasquenched with saturated solution of NaHCO₃ (100 mL) and extracted withethyl acetate (100 mL×2). Organic layer was washed with water (100 mL),dried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain6-bromo-4-ethyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine (600 mg,90%) as a transparent oil compound.

LCMS: 260 [M+H]⁺

Step-3: Synthesis of4-ethyl-8-fluoro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine:6-bromo-4-ethyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine (600 mg,2.31 mmol, 1 equiv),4,4,5,5-tetramethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,2-dioxaborolane(706 mg, 2.77 mmol, 1.2 equiv), Potassium acetate (679 mg, 6.93 mmol, 3equiv) and dioxane (15 mL) were charged in a 25 mL glass bottle. Purgedthe reaction mixture with nitrogen gas for 15 min, Pd(dppf)Cl2. DCM (94mg, 0.11 mmol, 0.05 equiv) was added to above mixture and the reactionmixture was allowed to stir at 100° C. for 3 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL×2). Organic layer was washed with brine (50 mL) andwater (50 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain4-ethyl-8-fluoro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(700 mg, 90%) as a dark brown viscous compound.

LCMS: 308 [M+H]⁺

Step-4: Synthesis of6-(2-chloro-5-fluoropyrimidin-4-yl)-4-ethyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine:To a stirred solution of 2,4-dichloro-5-fluoropyrimidine (300 mg, 1.8mmol, 1 equiv) in THF: Water (1:1=10 mL) was added4-ethyl-8-fluoro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(555 mg, 1.8 mmol, 1 equiv), Potassium carbonate (499 mg, 3.6 mmol, 2equiv) and Pd(PPh3)4 (104 mg, 0.09 mmol, 0.05 equiv). The reactionmixture was allowed to stir at 80° C. for 3 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL×2). Organic layer was washed with water (100 mL) andbrine (100 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude compound, whichwas purified by normal phase combi-flash to obtain6-(2-chloro-5-fluoropyrimidin-4-yl)-4-ethyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine(150 mg, 27%) as a yellow solid compound.

LCMS: 312 [M+H]⁺

Step-5: Synthesis of tert-butyl4-(4-((4-(4-ethyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)-2-fluorophenyl)piperazine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-4-ethyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.32 mmol, 1 equiv) in Dioxane (10 mL), was added tert-butyl4-(4-amino-2-fluorophenyl)piperazine-1-carboxylate (104 mg, 0.35 mmol,1.1 equiv) and cesium carbonate (157 mg, 0.48 mmol, 1.5 equiv). Thereaction mixture was purged with nitrogen gas for 30 min, followed bythe addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.013 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brine(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound, which waspurified by reverse phase HPLC to obtain tert-butyl4-(4-((4-(4-ethyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)-2-fluorophenyl)piperazine-1-carboxylate(60 mg, 33%) as a yellow solid compound.

LCMS: 571[M+H]⁺

Step-6: Synthesis of4-(4-ethyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)pyrimidin-2-amine:Tert-butyl4-(4-((4-(4-ethyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)-2-fluorophenyl)piperazine-1-carboxylate(60 mg, 0.1 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL) andthe resultant reaction mixture was allowed to stir at 50° C. for 1 h.Progress of the reaction was monitored by LCMS. After completion of thereaction, solvent was removed under reduced pressure and the residue wasdried under lyophilizer to obtain4-(4-ethyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)pyrimidin-2-amine(40 mg, 75%) as a brick red color solid compound.

LCMS: 471[M+H]⁺

¹HNMR: (400 MHz, DMSO-d6) δ 9.81 (s, 1H), 9.19 (d, J=6.7 Hz, 1H), 8.58(d, J=3.9 Hz, 1H), 7.80 (dd, J=15.1,2.4 Hz, 1H), 7.39 (dd, J=11.6, 9.1Hz, 1H), 7.30 (s, 1H), 7.19-7.00 (m, 2H), 4.32 (t, J=4.1 Hz, 2H),3.49-3.37 (m, 4H), 3.26-3.13 (m, 8H), 1.13 (t, J=7.0 Hz, 3H).

Example-36 Synthesis of 5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-propyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(Compound 36):

Step-1: Synthesis of6-bromo-8-fluoro-4-propyl-2H-benzo[b][1,4]oxazin-3(4H)-one: To a stirredsolution of 6-bromo-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one (700 mg,2.85 mmol, 1 equiv) in DMF (10 mL), was added K₂CO₃ (789 mg, 5.71 mmol,2 equiv) and iodopropane (0.6 mL, 5.71 mmol, 2 equiv). The reactionmixture was allowed to stir at 80° C. for 3 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (50 mL), solid observed wasfiltered dried under vacuum to obtain6-bromo-8-fluoro-4-propyl-2H-benzo[b][1,4]oxazin-3(4H)-one (750 mg, 92%)as an off white solid compound.

LCMS: 288 [M+H]⁺

Step-2: Synthesis of6-bromo-8-fluoro-4-propyl-3,4-dihydro-2H-benzo[b][1,4]oxazine: To astirred solution of6-bromo-8-fluoro-4-propyl-2H-benzo[b][1,4]oxazin-3(4H)-one (750 mg, 2.6mmol, 1 equiv) in THF (10 mL), was added BH₃.DMS (1 mL, 10.4 mmol, 4equiv) at 0° C. drop wise. The reaction mixture was allowed to stir at80° C. for overnight. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, the reaction mixture wasquenched with saturated solution of NaHCO₃ (100 mL) and extracted withethyl acetate (100 mL×2). Organic layer was washed with water (100 mL),dried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain6-bromo-8-fluoro-4-propyl-3,4-dihydro-2H-benzo[b][1,4]oxazine (650 mg,91%) as a transparent oil compound.

LCMS: 274 [M+H]⁺

Step-3: Synthesis of8-fluoro-4-propyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine:6-bromo-8-fluoro-4-propyl-3,4-dihydro-2H-benzo[b][1,4]oxazine (650 mg,2.31 mmol, 1 equiv),4,4,5,5-tetramethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,2-dioxaborolane(725 mg, 2.85 mmol, 1.2 equiv), Potassium acetate (676 mg, 6.93 mmol, 3equiv) and dioxane (15 mL) were charged in a 25 mL glass bottle. Purgedthe reaction mixture with nitrogen gas for 15 min, Pd(dppf)Cl2. DCM (94mg, 0.11 mmol, 0.05 equiv) was added to above mixture and the reactionmixture was allowed to stir at 100° C. for 3 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL×2). Organic layer was washed with brine (50 mL) andwater (50 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain8-fluoro-4-propyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(650 mg, 85%) as a dark brown viscous compound.

LCMS: 322.1 [M+H]⁺

Step-4: Synthesis of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-propyl-3,4-dihydro-2H-benzo[b][1,4]oxazine:To a stirred solution of 2,4-dichloro-5-fluoropyrimidine (300 mg, 1.8mmol, 1 equiv) in THF: Water (1:1=10 mL) was added8-fluoro-4-propyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(580 mg, 1.8 mmol, 1 equiv), Potassium carbonate (499 mg, 3.6 mmol, 2equiv) and Pd(PPh3)4 (104 mg, 0.09 mmol, 0.05 equiv). The reactionmixture was allowed to stir at 80° C. for 3 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL×2). Organic layer was washed with water (100 mL) andbrine (100 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude compound, whichwas purified by normal phase combi-flash to obtain6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-propyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(200 mg, 34%) as a yellow solid compound.

LCMS: 326 [M+H]⁺

Step-5: Synthesis of tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-propyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-propyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.32 mmol, 1 equiv) in Dioxane (10 mL), was added tert-butyl4-(4-amino-2-fluorophenyl)piperazine-1-carboxylate (100 mg, 0.33 mmol,1.1 equiv) and cesium carbonate (147 mg, 0.45 mmol, 1.5 equiv). Thereaction mixture was purged with nitrogen gas for 30 min, followed bythe addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.013 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brine(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound, which waspurified by reverse phase HPLC to obtain tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-propyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate(50 mg, 28%) as a yellow solid compound.

LCMS: 585[M+H]⁺

Step-6: Synthesis of 5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-propyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-propyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate(50 mg, 0.08 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure and the residuewas dried under lyophilizer to obtain5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-propyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(35 mg, 78%) as a brick red color solid compound.

LCMS: 485[M+H]⁺

¹HNMR: (400 MHz, DMSO-d6) δ 9.82 (s, 1H), 9.30-9.23 (m, 1H), 8.58 (d,J=3.9 Hz, 1H), 7.79 (dd, J=15.3, 2.4 Hz, 1H), 7.42 (dd, J=8.8, 2.4 Hz,1H), 7.27 (s, 1H), 7.14 (d, J=11.2 Hz, 1H), 7.05 (t, J=9.4 Hz, 1H), 4.30(t, J=4.3 Hz, 2H), 3.43 (t, J=4.3 Hz, 2H), 3.31 (t, J=7.3 Hz, 2H),3.26-3.13 (m, 8H),1.61 (h, J=7.4 Hz, 2H), 0.89 (t, J=7.3 Hz, 3H).

Example-37 Synthesis ofN⁵-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-N²,N²-dimethyl-2,3-dihydro-1H-indene-2,5-diamine(Compound 37):

Step-1: Synthesis N,N-dimethyl-5-nitro-1H-inden-2-amine: To a stirredsolution of 5-nitro-1,3-dihydro-2H-inden-2-one (1000 mg, 5.64 mmol, 1equiv) in THF (15 mL), was added dimethyl amine (2 M in THF) (5.6 mL,11.2 mmol, 2 equiv). The resultant reaction mixture was allowed to stirat RT for overnight. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, the mixture was diluted with icewater (50 mL) and extracted with EtoAc (100 mL×2). Organic layer waswashed with water (100 mL) and brine (100 mL). Organic layer was driedover anhydrous sodium sulphate and concentrated under reduced pressureto obtain obtain N,N-dimethyl-5-nitro-1H-inden-2-amine (800 mg, 69%) asa brown crystal solid compound.

LCMS: 205 [M+H]⁺

Step-2: Synthesis of N2, N2-dimethyl-2,3-dihydro-1H-indene-2,5-diamine:To a stirred solution of N,N-dimethyl-5-nitro-1H-inden-2-amine (800 mg,3.9 mmol, 1 equiv) in methanol (10 mL), was added Pd/C (20% w/w) (160mg) under H₂ atm. The resultant reaction mixture was allowed to stir atRT for overnight. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, the mixture was passes throughcelite bed and the filtrate was concentrated under reduced pressure toobtain N2, N2-dimethyl-2,3-dihydro-1H-indene-2,5-diamine (600 mg, 87%)as a dark brown solid compound.

LCMS: 177 [M+H]⁺

Step-3: Synthesis ofN5-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-N2,N2-dimethyl-2,3-dihydro-1H-indene-2,5-diamine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added N2,N2-dimethyl-2,3-dihydro-1H-indene-2,5-diamine (58 mg, 0.33 mmol, 1.1equiv) and cesium carbonate (147 mg, 0.45 mmol, 1.5 equiv). The reactionmixture was degassed with nitrogen gas for 30 min, followed by theaddition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP(8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtainN5-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-N2,N2-dimethyl-2,3-dihydro-1H-indene-2,5-diamine(5 mg, 4%) as a brown solid compound.

LCMS: 466 [M+H]⁺

¹HNMR (400 MHz, DMSO-d6) δ 9.57 (s, 1H), 8.53 (d, J=4.1 Hz, 1H),8.43-8.32 (m, 1H), 7.63 (s,1H), 7.46 (d, J=8.1 Hz, 1H), 7.41 (s, 1H),7.15 (d, J=11.7 Hz, 1H), 7.08 (d, J=8.1 Hz, 1H), 4.33-4.21 (m, 2H), 4.13(dt, J=13.1, 7.3 Hz, 1H), 3.34-3.27 (m, 3H), 2.95 (h, J=6.7, 5.6 Hz,2H), 2.73 (td,J=14.5, 13.6, 6.1 Hz, 2H), 2.20 (s, 6H), 1.19 (d, J=6.5Hz, 6H).

Example-38 Synthesis of N-(6-(4-(dimethyl amino) piperidin-1-yl)pyridin-3-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(Compound 38):

Step-1: Synthesis N,N-dimethyl-1-(5-nitropyridin-2-yl)piperidin-4-amine: To a stirred solution of 2-chloro-5-nitropyridine(500 mg, 3.16 mmol, 1 equiv) in DMF (10 mL), was added K₂CO₃ (654 mg,4.74 mmol, 1.5 equiv) and N,N-dimethylpiperidin-4-amine (405 mg, 3.16mmol, 1 equiv). The resultant reaction mixture was allowed to stir at100° C. for overnight. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, the mixture was diluted with icewater (50 mL), solid observed was filtered and dried under vacuum toobtain N,N-dimethyl-1-(5-nitropyridin-2-yl)piperidin-4-amine (700 mg,89%) as a yellow solid compound.

LCMS: 251 [M+H]⁺

Step-2: Synthesis of 6-(4-(dimethyl amino) piperidin-1-yl)pyridin-3-amine: To a stirred solution ofN,N-dimethyl-1-(5-nitropyridin-2-yl)piperidin-4-amine (500 mg, 2 mmol, 1equiv) in ethanol (9 mL), water (3 mL), was added iron powder (336 mg, 6mmol, 3 equiv) and ammonium chloride (216 mg, 4 mmol, 2 equiv). Theresultant reaction mixture was allowed to stir at 90° for 1 h. Progressof the reaction was monitored by TLC and LCMS. After completion of thereaction, the mixture was passes through celite bed and the filtrate wasconcentrated under reduced pressure to obtain 6-(4-(dimethyl amino)piperidin-1-yl) pyridin-3-amine (400 mg, 91%) as a dark brown viscouscompound.

LCMS: 221 [M+H]⁺

Step-3: Synthesis of N-(6-(4-(dimethyl amino) piperidin-1-yl)pyridin-3-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added 6-(4-(dimethylamino) piperidin-1-yl) 240yridine-3-amine (73 mg, 0.33 mmol, 1.1 equiv)and cesium carbonate (147 mg, 0.45 mmol, 1.5 equiv). The reactionmixture was degassed with nitrogen gas for 30 min, followed by theaddition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP(8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtainN-(6-(4-(dimethylamino)piperidin-1-yl)240yridine-3-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(3 mg, 2%) as a yellow solid compound.

LCMS: 510 [M+H]⁺

¹HNMR (400 MHz, DMSO-d6) δ 9.37 (s, 1H), 8.48 (d, J=4.4 Hz, 2H), 8.32(br. S, 1H), 7.79 (dd, J=9.0, 2.4 Hz, 1H), 7.42 (br. S, 1H), 7.13 (d,J=11.0 Hz, 1H), 6.82 (d, J=8.8 Hz, 1 H), 4.29 (br. S, 2H), 4.22 (d,J=12.3 Hz, 2H), 4.04-4.14 (m, 1H), 3.29 (br. S, 2H), 2.74 (t, J=11.6 Hz,2H), 2.34 (d, J=12.7 Hz, 1H), 2.22 (s, 6H), 1.82 (d, J=11.0 Hz, 2H),1.38 (d, J=9.2 Hz, 2H), 1.05-1.23 (m, 6H).

Example-39: Synthesis of4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1′,2′,3′,6′-tetrahydro-2H-[1,4′-bipyridin]-2-one(Compound 39):

Step-1: Synthesis of(E/Z)-N,N-dimethyl-N′-(2-oxo-1,2-dihydropyridin-4-yl)formimidamide:4-aminopyridin-2(1H)-one (200 mg, 1.8 mmol, 1 equiv) was taken in1,1-dimethoxy-N,N-dimethylmethanamine (4 mL) and the resultant reactionmixture was stirred at 80° C. for 2 h. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, the reactionmixture was concentrated under vacuum to afford(E/Z)-N,N-dimethyl-N′-(2-oxo-1,2-dihydropyridin-4-yl)formimidamide (220mg).

LCMS: 166 [M+H]⁺

Step-2:Synthesis of tert-butyl(E/Z)-4-(4-(((dimethylamino)methylene)amino)-2-oxopyridin-1(2H)-yl)piperidine-1-carboxylate:To a solution of(E/Z)-N,N-dimethyl-N′-(2-oxo-1,2-dihydropyridin-4-yl)formimidamide (500mg, 3 mmol, 1 equiv) in DMF (10 mL), was added tert-butyl4-bromo-3,6-dihydropyridine-1(2H)-carboxylate (730 mg, 4.5 mmol, 1.5equiv) followed by addition of potassium carbonate (700 mg, 5.1 mmol,1.7 equiv), CuI (57 mg, 0.3 mmol, 0.1 equiv), L-proline (68 mg, 0.6mmol, 0.2 equiv) . The resultant reaction mixture was stirred at 100° C.for 16 h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the reaction mixture was diluted with water(30 mL) and extracted with EtOAc (50 mL). The organic layer dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude compound, which was purified by making HCL salt to affordtert-butyl(E)-4-(4-(((dimethylamino)methylene)amino)-2-oxopyridin-1(2H)-yl)piperidine-1-carboxylate(150 mg). LCMS:347 [M+H]⁺

Step-3: Synthesis tert-butyl4-amino-2-oxo-3′,6′-dihydro-2H-[1,4′-bipyridine]-1′(2′H)-carboxylate: Toa solution of tert-butyl(E)-4-(4-(((dimethylamino)methylene)amino)-2-oxopyridin-1(2H)-yl)piperidine-1-carboxylate(135 mg, 0.4 mmol, 1 equiv) in ethanol (5 mL), was added ethylenediamine (35 mg, 0.6 mmol, 1.5 equiv. The resultant reaction mixture wasstirred at 80° C. for 3 h. Progress of the reaction was monitored by TLCand LCMS. After completion of the reaction, the reaction mixture wasconcentrated, diluted with water (10 mL) and extracted with EtOAc (10mL). The organic layer dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain tert-butyl4-amino-2-oxo-3′, 6′-dihydro-2H-[1,4′-bipyridine]-1′(2′H)-carboxylate(98 mg). LCMS: 292 [M+H]⁺

Step-4: Synthesis of tert-butyl4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-oxo-3′,6′-dihydro-2H-[1,4′-bipyridine]-1′(2′H)-carboxylate: To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-2-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (3 mL), was added tert-butyl4-amino-2-oxo-3′, 6′-dihydro-2H-[1,4′-bipyridine]-1′(2′H)-carboxylate(98 mg, 0.33 mmol, 1.1 equiv) and cesium carbonate (146 mg, 0.45 mmol,1.5 equiv). The reaction mixture was aerated with nitrogen gas for 10min. followed by the addition of palladium acetate (6 mg, 0.03 mmol, 0.1equiv) and BINAP (37 mg, 0.06 mmol, 0.2 equiv) again purged nitrogen for5 min. The resultant reaction mixture was stirred at 100° C. for 16 h.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the reaction mixture was diluted with water (10 mL) andextracted with EtOAc (15 mL). The organic layer dried over anhydroussodium sulphate and concentrated under reduced pressure to obtain crudecompound used directly for next step. 100 mg of tert-butyl4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-oxo-3′,6′-dihydro-2H-[1,4′-bipyridine]-1′(2′H)-carboxylate obtained as a crude.LCMS: 581 [M+H]+

Step-5: Synthesis of4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1′,2′, 3′, 6′-tetrahydro-2H-[1,4′-bipyridin]-2-one: tert-butyl4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-oxo-3′,6′-dihydro-2H-[1,4′-bipyridine]-1′(2′H)-carboxylate (100 mg, 0.17 mmol,1 equiv) was taken in 1.25 M HCl in ethanol (4 mL) and the resultantreaction mixture was stirred at 50° C. for 2 h. Progress of the reactionwas monitored by LCMS. After completion of the reaction, the reactionmixture was concentrated under vacuum purified by reverse phase HPLC toafford4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1′,2′, 3′, 6′-tetrahydro-2H-[1,4′-bipyridin]-2-one (4 mg). LCMS: 481 [M+H]⁺

¹HNMR: (400 MHz ,METHANOL-d₄) δ 8.50 (d, J=3.9 Hz, 1H), 7.53 (s, 1H),7.41-7.34 (m, 1H), 7.26 (br. s, 1H), 6.73 (d, J=7.5 Hz, 1H), 5.95 (br.s, 1H), 4.58 (br. s, 1H), 4.41-4.19 (m, 2H), 3.81 (br. s, 1H), 3.48 (br.s, 1H), 3.41 (d, J=6.6 Hz, 1H), 2.69 (br. s, 1H), 1.39-1.12 (m, 3H).

Example-40 Synthesis of5-chloro-4-(8-chloro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(3-fluoro-4-(piperazin-1-yl)phenyl)pyrimidin-2-amine(Compound 52)

Step-1: Synthesis of6-bromo-8-chloro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one: To astirred solution of 6-bromo-8-chloro-2H-benzo[b][1,4]oxazin-3(4H)-one(2000 mg, 7.6 mmol, 1 equiv) in DMF (20 mL), was added NaH (610 mg, 15.2mmol, 2 equiv) and isopropyl iodide (1.5 mL, 15.2 mmol, 2 equiv). Thereaction mixture was allowed to stir at 80° C. for 3 h. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, the reaction mixture was diluted with water (100 mL) andextracted with ethyl acetate (100 mL×2). Organic layer was washed withbrine (100 mL) and water (100 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain 6-bromo-8-chloro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one(700 mg, 95%) as an off white solid compound. LCMS: 260 [M+H]⁺

Step-2: Synthesis of6-bromo-8-chloro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine: To astirred solution of6-bromo-8-chloro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one (650 mg,2.1 mmol, 1 equiv) in THF (15 mL), was added BH₃.DMS (2 M in THF) (4 mL,8.5 mmol, 4 equiv) at 0° C. drop wise. The reaction mixture was allowedto stir at 80° C. for overnight. Progress of the reaction was monitoredby TLC and LCMS. After completion of the reaction, the reaction mixturewas quenched with saturated solution of NaHCO₃ (50 mL) and extractedwith ethyl acetate (100 mL×2). Organic layer was washed with water (100mL), dried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain6-bromo-8-chloro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine (550mg, 89%) as a transparent oil compound. LCMS: 290 [M+H]⁺

Step-3: Synthesis of8-chloro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine:6-bromo-8-chloro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine (550mg, 1.9 mmol, 1 equiv),4,4,5,5-tetramethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,2-dioxaborolane(725 mg, 2.8 mmol, 1.5 equiv), Potassium acetate (466 mg, 4.7 mmol, 2.5equiv) and dioxane (10 mL) were charged in a 25 mL glass bottle. Purgedthe reaction mixture with nitrogen gas for 15 min, Pd(dppf)Cl2. DCM (78mg, 0.09 mmol, 0.05 equiv) was added to above mixture and the reactionmixture was allowed to stir at 100° C. for 3 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL×2). Organic layer was washed with brine (100 mL) andwater (100 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain8-chloro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(600 mg, 94%) as a dark brown viscous compound. LCMS: 338 [M+H]⁺

Step-4: Synthesis of8-chloro-6-(2,5-dichloropyrimidin-4-yl)-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine:To a stirred solution of 2,4,5-trichloropyrimidine (160 mg, 0.87 mmol, 1equiv) in THF: Water (1:1=10 mL) was added8-chloro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(296 mg, 0.87 mmol, 1 equiv), Potassium carbonate (240 mg, 1.74 mmol, 2equiv) and Pd(PPh3)4 (50 mg, 0.04 mmol, 0.05 equiv). The reactionmixture was allowed to stir at 80° C. for 3 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL×2). Organic layer was washed with water (100 mL) andbrine (100 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude compound, whichwas purified by normal phase combi-flash to obtain8-chloro-6-(2,5-dichloropyrimidin-4-yl)-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(300 mg, 80%) as a yellow solid compound.

LCMS: 358 [M+H]⁺

Step-5: Synthesis of tert-butyl4-(4-((5-chloro-4-(8-chloro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-fluorophenyl)piperazine-1-carboxylate:To a solution of8-chloro-6-(2,5-dichloropyrimidin-4-yl)-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.28 mmol, 1 equiv) in Dioxane (10 mL), was added tert-butyl4-(4-amino-2-fluorophenyl)piperazine-1-carboxylate (91 mg, 0.3 mmol, 1.1equiv) and cesium carbonate (137 mg, 0.42 mmol, 1.5 equiv). The reactionmixture was purged with nitrogen gas for 30 min, followed by theaddition of palladium acetate (1.2 mg, 0.005 mmol, 0.02 equiv) and BINAP(7 mg, 0.011 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brine(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound, which waspurified by reverse phase HPLC to obtain tert-butyl4-(4-((5-chloro-4-(8-chloro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-fluorophenyl)piperazine-1-carboxylate(30 mg, 16%) as a yellow solid compound. LCMS: 617 [M+H]⁺

Step-6: Synthesis of5-chloro-4-(8-chloro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(3-fluoro-4-(piperazin-1-yl)phenyl)pyrimidin-2-amine:Tert-butyl 4-(4-((5-chloro-4-(8-chloro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-fluorophenyl)piperazine-1-carboxylate(30 mg, 0.04 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure and the residuewas dried under lyophilizer to obtain5-chloro-4-(8-chloro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(3-fluoro-4-(piperazin-1-yl)phenyl)pyrimidin-2-amine(25 mg, 93%) as an orange color solid compound. LCMS: 517 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 9.97 (s, 1H), 8.93 (s, 1H), 8.58 (s, 1H), 7.79 (dd,J=15.3, 2.5 Hz,1H), 7.40 (dd, J=9.0, 2.5 Hz, 1H), 7.25 (s, 1H), 7.16 (d,J=2.0 Hz, 1H), 7.04 (t, J=9.3 Hz, 1H), 4.33 (t,J=4.2 Hz, 2H), 4.11 (p,J=6.7 Hz, 1H), 3.30 (t, J=4.1 Hz, 2H), 3.24 (s, 4H), 3.15 (t, J=4.9 Hz,4H),1.17 (d, J=6.4 Hz, 6H).

Example-41 Synthesis of N-(5-(4-(dimethylamino) piperidin-1-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine.(Compound436)

Step-1: Synthesis N,N-dimethyl-1-(6-nitropyridin-3-yl)piperidin-4-amine: To a stirred solution of 5-bromo-2-nitropyridine (500mg, 2.47 mmol, 1 equiv) in DMF (10 mL), was added K₂CO₃ (683 mg, 4.95mmol, 2 equiv) and N,N-dimethylpiperidin-4-amine (316 mg, 2.47 mmol, 1equiv). The resultant reaction mixture was allowed to stir at 100° C.for overnight. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, the mixture was diluted with ice water(50 mL) and extracted with ethyl acetate (100 mL). Organic layer waswashed with water (50 mL) and brine solution (50 mL). Organic layer wasdried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain N,N-dimethyl-1-(6-nitropyridin-3-yl)piperidin-4-amine (500 mg, 81%) as a yellow solid compound. LCMS: 251[M+H]⁺

Step-2: Synthesis of 5-(4-(dimethylamino) piperidin-1-yl)pyridin-2-amine: To a stirred solution ofN,N-dimethyl-1-(6-nitropyridin-3-yl) piperidin-4-amine (500 mg, 2 mmol,1 equiv) in ethanol (7 mL), water (3 mL), was added iron powder (336 mg,6 mmol, 3 equiv) and ammonium chloride (216 mg, 4 mmol, 2 equiv). Theresultant reaction mixture was allowed to stir at 90° C. for 1 h.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the mixture was passes through celite bed and thefiltrate was concentrated under reduced pressure to obtain5-(4-(dimethylamino) piperidin-1-yl) pyridin-2-amine (350 mg, 80%) as adark brown solid compound. LCMS: 221 [M+H]⁺

Step-3: Synthesis of N-(5-(4-(dimethylamino) piperidin-1-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added5-(4-(dimethylamino) piperidin-1-yl) pyridin-2-amine (73 mg, 0.33 mmol,1.1 equiv) and cesium carbonate (147 mg, 0.45 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtainN-(5-(4-(dimethylamino)piperidin-1-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(12 mg, 8%) as a yellow solid compound. LCMS: 510 [M+H]⁺; ¹HNMR (400MHz, DMSO-d6) δ 9.64 (s, 1H), 8.55 (d, J=4.0 Hz, 1H), 8.46 (s, 1H),8.04-7.96 (m,2H), 7.46 (s, 1H), 7.38 (dd, J=9.1,3.1 Hz, 1H), 7.17 (d,J=11.6 Hz, 1H), 4.30 (t, J=4.3 Hz, 2H), 4.15(p, J=6.6 Hz, 1H), 3.64 (dd,J=12.3,4.4 Hz, 2H), 3.34-3.27 (m, 3H), 2.72-2.61 (m,2H), 2.19 (s, 6H),1.89-1.80 (m, 2H), 1.50 (qd, J=12.1,3.8 Hz, 2H), 1.19 (d, J=6.5 Hz, 6H).

Example-42 Synthesis of4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1-(piperidin-4-yl)pyridin-2(1H)-one:(Compound 437)

Step-1: Synthesis of tert-butyl 4-(4-amino-oxopyridin-1(2H)-yl)piperidine-1-carboxylate: To a stirred solution of tert-butyl4-amino-2-oxo-3′, 6′-dihydro-2H-[1,4′-bipyridine]-1′(2′H)-carboxylate(95 mg, 0.33 mmol, 1 equiv) in methanol (4 mL), was added Platinum oxide(25 mg, 0.11 mmol, 0.3 equiv) at RT. The reaction mixture was allowed tostir at RT for 2h. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, the reaction mixture was passedthrough cealite bed. Filtrate was concentrated to afford tert-butyl4-(4-amino-2-oxopyridin-1(2H)-yl) piperidine-1-carboxylate (90 mg) asoff white solid compound. LCMS: 294 [M+H]⁺

Step-2: Synthesis of tert-butyl4-(4-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-oxopyridin-1(2H)-yl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-2-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(70 mg, 0.21 mmol, 1 equiv) in dioxane (3 mL), was added4-(4-amino-2-oxopyridin-1(2H)-yl)piperidine-1-carboxylate (68 mg, 0.23mmol, 1.1 equiv) and cesium carbonate (102 mg, 0.31 mmol, 1.5 equiv).The reaction mixture was aerated with nitrogen gas for 10 min. followedby the addition of palladium acetate (5 mg, 0.03 mmol, 0.1 equiv) andBINAP (26 mg, 0.06 mmol, 0.2 equiv) again purged nitrogen for 5 min. Theresultant reaction mixture was stirred at 100° C. for 16 h. Progress ofthe reaction was monitored by TLC and LCMS. After completion of thereaction, the reaction mixture was diluted with water (10 mL) andextracted with EtOAc (15 mL). The organic layer dried over anhydroussodium sulphate and concentrated under reduced pressure to obtain crudecompound used directly for next step. 140 mg of tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-oxopyridin-1(2H)-yl)piperidine-1-carboxylate obtained as acrude. LCMS: 583 [M+H]⁺

Step-3: Synthesis of4-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1-(piperidin-4-yl)pyridin-2(1H)-one:A solution of tert-butyl4-(4-((5-chloro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-fluorophenyl)piperazine-1-carboxylate(70 mg, 0.11 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure and crude was purified by reverse phase HPLC to obtain4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1-(piperidin-4-yl)pyridin-2(1H)-one(16 mg) as an off white solid compound. LCMS: 483 [M+H]⁺; ¹HNMR (400MHz, DMSO-d6) δ 9.98 (s, 1H), 8.68 (d, J=3.9 Hz, 1H), 8.35 (d, J=10.8Hz, 2H), 7.52 (d, J=7.6 Hz, 1H), 7.44 (s, 1H), 7.17 (d, J=11.8 Hz, 1H),7.13 (d, J=2.5 Hz, 1H), 6.49 (dd, J=7.8, 2.5 Hz, 1H), 4.75-4.66 (m, 1H),4.31 (t, J=4.3 Hz, 2H), 4.21 (p, J=6.5 Hz, 1H), 3.31 (t, J=4.4 Hz, 3H),3.19-3.06 (m, 3H), 2.44 (s, 1H), 1.68 (d, J=8.2 Hz, 4H), 1.24 (d, J=4.0Hz, OH), 1.19 (d, J=6.5 Hz,7H).

Example-43 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-(piperidin-4-yl)-3-(trifluoromethyl)phenyl)pyrimidin-2-amine.(Compound438)

Step-1: Synthesis of tert-butyl 4-(4-amino-2-(trifluoromethyl)phenyl)-3,6-dihydropyridine-1(2H)-carboxylate: To a solution of4-bromo-3-(trifluoromethyl)aniline (1000 mg, 4.18 mmol, 1 equiv) indioxane (15 mL), was added tert-butyl4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydropyridine-1(2H)-carboxylate (1292 mg, 4.18 mmol, 1 equiv) andsodium carbonate (1053 mg, 12.5 mmol, 3 equiv). The reaction mixture wasdegassed with nitrogen gas for 30 min, followed by the addition of Pd(PPh₃)₂Cl₂ (242 mg, 0.2 mmol, 0.05 equiv). The resultant reactionmixture was allowed to stir at 100° C. for overnight. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, reaction mixture was diluted with water (50 mL) and extractedwith ethyl acetate (100 mL×2). Organic layer was washed with water (100mL) and brine solution (100 mL). Organic layer was dried over anhydroussodium sulphate and concentrated under reduced pressure to obtain crude,which was purified by normal phase combi flash to obtain tert-butyl4-(4-amino-2-(trifluoromethyl) phenyl)-3,6-dihydropyridine-1(2H)-carboxylate (1200 mg, 87%) as a brown solidcompound. LCMS: 373 [M+H]⁺

Step-2: Synthesis of tert-butyl 4-(4-amino-2-(trifluoromethyl) phenyl)piperidine-1-carboxylate: To a stirred solution of tert-butyl4-(4-amino-2-(trifluoromethyl)phenyl)-3,6-dihydropyridine-1(2H)-carboxylate (500 mg, 1.34 mmol, 1equiv) in methanol (5 mL), was added PtO₂ (20% w/w) (100 mg) under H₂atm. The resultant reaction mixture was allowed to stir at RT forovernight. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, the mixture was passes through celite bedand the filtrate was concentrated under reduced pressure to obtaintert-butyl 4-(4-amino-2-(trifluoromethyl) phenyl)piperidine-1-carboxylate (400 mg, 87%) as a transparent oil compound.LCMS: 345 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-(trifluoromethyl)phenyl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(4-amino-2-(trifluoromethyl) phenyl) piperidine-1-carboxylate (114 mg,0.33 mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5equiv). The reaction mixture was degassed with nitrogen gas for 30 min,followed by the addition of palladium acetate (2 mg, 0.006 mmol, 0.02equiv) and BINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reactionmixture was allowed to stir at 100° C. for overnight. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, diluted with water (30 mL) and extracted with ethyl acetate(100 mL). Organic layer was washed with water (50 mL) and brine solution(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude, which was purifiedby normal phase combi flash to obtain tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-(trifluoromethyl)phenyl)piperidine-1-carboxylate(100 mg, 51%) as a yellow solid compound. LCMS: 634 [M+H]⁺

Step-4: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-(piperidin-4-yl)-3-(trifluoromethyl)phenyl)pyrimidin-2-amine:A solution of tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-(trifluoromethyl)phenyl)piperidine-1-carboxylate(100 mg, 0.15 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-(piperidin-4-yl)-3-(trifluoromethyl)phenyl)pyrimidin-2-amine(10 mg, 12%) as a yellow solid compound. LCMS: 534 [M+H]⁺; ¹HNMR (400MHz, DMSO-d₆) δ 10.04 (s, 1H), 8.63 (d, J=3.9 Hz, 1H), 8.54-8.40 (m,1H), 8.25 (d, J=2.4 Hz, 1H), 8.05-7.97 (m, 1H), 7.42 (d, J=8.7 Hz, 1H),7.37 (s, 1H), 7.18 (d, J=11.6 Hz, 1H), 4.30(t, J=4.2 Hz, 2H), 4.12 (h,J=6.6 Hz, 1H), 3.37 (d, J=12.0 Hz, 2H), 3.14-3.00 (m, 3H), 1.98-1.78 (m,4H), 1.18 (d, J=6.5 Hz, 6H).

Example-44 Synthesis ofN-(4-(4-(dimethylamino)piperidin-1-yl)-3-(trifluoromethyl)phenyl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine.(Compound178)

Step-1: Synthesis N,N-dimethyl-1-(4-nitro-2-(trifluoromethyl) phenyl)piperidin-4-amine: To a stirred solution of1-bromo-4-nitro-2-(trifluoromethyl) benzene (500 mg, 1.85 mmol, 1 equiv)in DMF (10 mL), was added TEA (0.5 mL) and N,N-dimethylpiperidin-4-amine(237 mg, 1.85 mmol, 1 equiv). The resultant reaction mixture was allowedto stir at 100° for overnight. Progress of the reaction was monitored byTLC and LCMS. After completion of the reaction, diluted with water (30mL) and extracted with ethyl acetate (100 mL×2). Organic layer waswashed with water (50 mL) and brine solution (50 mL). Organic layer wasdried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain N,N-dimethyl-1-(4-nitro-2-(trifluoromethyl) phenyl)piperidin-4-amine (500 mg, 85%) as a yellow viscous compound. LCMS: 318[M+H]⁺

Step-2: Synthesis of 1-(4-amino-2-(trifluoromethyl)phenyl)-N,N-dimethylpiperidin-4-amine: To a stirred solution ofN,N-dimethyl-1-(4-nitro-2-(trifluoromethyl)phenyl)piperidin-4-amine (500mg, 1.5 mmol, 1 equiv) in ethanol (7 mL), water (3 mL), was added ironpowder (265 mg, 4.7 mmol, 3 equiv) and ammonium chloride (162 mg, 3mmol, 2 equiv). The resultant reaction mixture was allowed to stir at90° for 1 h. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, the mixture was passes through celitebed and the filtrate was concentrated under reduced pressure to obtain1-(4-amino-2-(trifluoromethyl) phenyl)-N,N-dimethylpiperidin-4-amine(400 mg, 88%) as a dark brown solid compound. LCMS: 288 [M+H]⁺

Step-3: Synthesis ofN-(4-(4-(dimethylamino)piperidin-1-yl)-3-(trifluoromethyl)phenyl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added1-(4-amino-2-(trifluoromethyl) phenyl)-N,N-dimethylpiperidin-4-amine (95mg, 0.33 mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.45 mmol, 1.5equiv). The reaction mixture was degassed with nitrogen gas for 30 min,followed by the addition of palladium acetate (2 mg, 0.006 mmol, 0.02equiv) and BINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reactionmixture was allowed to stir at 100° C. for overnight. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, diluted with water (30 mL) and extracted with ethyl acetate(100 mL). Organic layer was washed with water (50 mL) and brine solution(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude, which was purifiedby reverse phase HPLC to obtainN-(4-(4-(dimethylamino)piperidin-1-yl)-3-(trifluoromethyl)phenyl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(40 mg, 23%) as a yellow solid compound. LCMS: 577 [M+H]⁺ ¹HNMR (400MHz, DMSO-d₆) δ 9.92 (s, 1H), 8.60 (d, J=4.0 Hz, 1H), 8.24 (s, 1H), 8.17(s, 1H), 7.97-7.90 (m, 1H), 7.46 (d, J=8.8 Hz, 1H), 7.37 (s, 1H), 7.17(d, J=11.5 Hz, 1H), 4.30 (t, J=4.2 Hz, 2H),4.12 (p, J=6.8 Hz, 1H),3.63-3.55 (m, 1H), 3.30 (t, J=4.8 Hz, 4H), 2.93 (d, J=11.1 Hz, 2H), 2.72(t, J=11.1 Hz, 2H), 2.23 (s, 7H), 1.82 (d, J=12.0 Hz, 2H), 1.58-1.43 (m,2H), 1.17 (d, J=6.5 Hz, 6H).

Example-45 Synthesis ofN7-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-N2,N2-dimethyl-1,2,3,4-tetrahydronaphthalene-2,7-diamine(Peak-1) (Compound 206) and Example-46: Synthesis ofN6-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-N2,N2-dimethyl-1,2,3,4-tetrahydronaphthalene-2,6-diamine(Peak-2) (Compound 47)

Step-1: Synthesis of N,N-dimethyl-1,2,3,4-tetrahydronaphthalen-2-amine:To a stirred solution of 3,4-dihydronaphthalen-2(1H)-one (5000 mg, 34.2mmol, 1 equiv) in THF (50 mL), was added NaCNBH₃ (2155 mg, 34.2 mmol, 1equiv), ZnCl₂ (2326 mg, 17.1 mmol, 0.5 equiv) and dimethyl amine (2M inTFH) (17 mL, 34.2 mmol, lequiv). The resultant reaction mixture wasallowed to stir at RT for overnight. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, solvent was removedunder reduced pressure and 1N HCl (100 mL) was added to above residue.The acidic solution was washed with ethyl acetate (100 mL×2), then madealkaline with aq. 5M NaOH solution (50 mL) and extracted with EtoAC (100mL×3). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtainN,N-dimethyl-1,2,3,4-tetrahydronaphthalen-2-amine (950 mg, 15%) as ayellow oil compound. LCMS: 176 [M+H]⁺

Step-2: Synthesis ofN,N-dimethyl-7-nitro-1,2,3,4-tetrahydronaphthalen-2-amine andN,N-dimethyl-6-nitro-1,2,3,4-tetrahydronaphthalen-2-amine: To a stirredsolution of N,N-dimethyl-1,2,3,4-tetrahydronaphthalen-2-amine (950 mg,5.4 mmol, 1 equiv) in THF (5 mL), was added HNO3 (0.9 mL, 21.7 mmol, 4equiv) at 0° C. The resultant reaction mixture was allowed to stir at RTfor overnight. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, the mixture was diluted with ice water (20mL), then made alkaline with aq. 5M NaOH solution (10 mL) and extractedwith EtoAC (100 mL×2).

Organic layer was dried over anhydrous sodium sulphate and concentratedunder reduced pressure to obtain a mixture ofN,N-dimethyl-7-nitro-1,2,3,4-tetrahydronaphthalen-2-amine andN,N-dimethyl-6-nitro-1,2,3,4-tetrahydronaphthalen-2-amine (700 mg, 58%)as a yellow oil compound. LCMS: 221 [M+H]⁺

Step-3: Synthesis ofN2,N2-dimethyl-1,2,3,4-tetrahydronaphthalene-2,7-diamine andN2,N2-dimethyl-1,2,3,4-tetrahydronaphthalene-2,6-diamine: To a stirredsolution of a mixture ofN,N-dimethyl-7-nitro-1,2,3,4-tetrahydronaphthalen-2-amine andN,N-dimethyl-6-nitro-1,2,3,4-tetrahydronaphthalen-2-amine (500 mg, 1.87mmol, 1 equiv) in ethanol (9 mL), water (3 mL), was added iron powder(535 mg, 9.5 mmol, 3 equiv) and ammonium chloride (335 mg, 6.2 mmol, 2equiv). The resultant reaction mixture was allowed to stir at 90° for 1h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the reaction mixture was passes throughcelite bed and the filtrate was concentrated under reduced pressure toobtain a mixture ofN2,N2-dimethyl-1,2,3,4-tetrahydronaphthalene-2,7-diamine andN2,N2-dimethyl-1,2,3,4-tetrahydronaphthalene-2,6-diamine (550 mg, 91%)as a brown solid compound. LCMS: 191 [M+H]⁺

Step-4: Synthesis ofN7-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-N2,N2-dimethyl-1,2,3,4-tetrahydronaphthalene-2,7-diamineandN6-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-N2,N2-dimethyl-1,2,3,4-tetrahydronaphthalene-2,6-diamine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(150 mg, 0.46 mmol, 1 equiv) and in dioxane (10 mL), was added a mixtureof N2,N2-dimethyl-1,2,3,4-tetrahydronaphthalene-2,7-diamine andN2,N2-dimethyl-1,2,3,4-tetrahydronaphthalene-2,6-diamine (97 mg, 0.5mmol, 1.1 equiv), followed by the addition of cesium carbonate (225 mg,0.69 mmol, 1.5 equiv). The reaction mixture was degassed with nitrogengas for 30 min, followed by the addition of palladium acetate (2 mg,0.009 mmol, 0.02 equiv) and BINAP (11 mg, 0.018 mmol, 0.04 equiv). Theresultant reaction mixture was allowed to stir at 100° C. for 16 h.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brinesolution (50 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by reverse phase HPLC to obtain two peaks asN7-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-N2,N2-dimethyl-1,2,3,4-tetrahydronaphthalene-2,7-diamineandN6-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-N2,N2-dimethyl-1,2,3,4-tetrahydronaphthalene-2,6-diamine(5 mg and 15 mg, 9%) as a yellow solid compound.LCMS: 480 [M+H]⁺;PEAK-1: ¹1HNMR (DMSO-d₆, 400 MHz): δ 9.86 (br. s, 1H), 8.46 (d, J=4.0Hz, 1H), 7.46 (d, J=7.5 Hz, 1H), 7.32 (s, 1H), 7.17 (t, J=7.7 Hz, 1H),7.10 (d, J=12.3 Hz, 1H), 6.98 (d, J=7.9 Hz, 1H), 4.27 (br. s, 2H), 4.01(p, J=6.5 Hz, 1H), 3.51 (br. s, 2H), 3.16 (d, J=11.0 Hz, 1H), 2.90-3.05(m, 2H), 2.82 (d, J=4.1 Hz, 6H), 2.28 (br. s, 1H), 1.93 (br. s, 1 H),1.71 (d, J=6.6 Hz, 1H), 1.49 (br. s, 1H), 1.14 ppm (t, J=7.0 Hz, 6H).

PEAK-2:¹HNMR (DMSO-d₆, 400 MHz): δ 9.61 (br. s, 1H), 8.55 (d, J=3.5 Hz,1H), 7.50-7.63 (m, 1H), 7.47 (br. s, 1H), 7.39 (d, J=6.6 Hz, 1H), 7.17(d, J=11.4 Hz, 1H), 6.93-7.05 (m, 1H), 4.29 (d, J=3.5 Hz, 2H), 4.07-4.20(m, 1H), 3.51 (br. s, 2H), 2.97 (br. s, 1H), 2.85 (br. s, 2H), 2.69 (d,J=11.8 Hz, 6H), 2.17 (d, J=7.5 Hz, 1H), 1.91 (br. s, 1H), 1.72 (br. s,1H), 1.49 (br. s, 1H), 1.19 ppm (d, J=6.6 Hz, 6H).

Example-47 Synthesis of4-(8-chloro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)pyrimidin-2-amine.(Compound439)

Step-1: Synthesis of6-bromo-8-chloro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one: To astirred solution of 6-bromo-8-chloro-2H-benzo[b][1,4]oxazin-3(4H)-one(2000 mg, 7.6 mmol, 1 equiv) in DMF (20 mL), was added NaH (610 mg, 15.2mmol, 2 equiv) and isopropyl iodide (1.5 mL, 15.2 mmol, 2 equiv). Thereaction mixture was allowed to stir at 80° C. for 3 h. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, the reaction mixture was diluted with water (100 mL) andextracted with ethyl acetate (100 mL×2). Organic layer was washed withbrine (100 mL) and water (100 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain 6-bromo-8-chloro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one(700 mg, 95%) as an off white solid compound. LCMS: 260 [M+H]⁺

Step-2: Synthesis of6-bromo-8-chloro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine: To astirred solution of6-bromo-8-chloro-4-isopropyl-2H-benzo[b][1,4]oxazin-3(4H)-one (650 mg,2.1 mmol, 1 equiv) in THF (15 mL), was added BH₃.DMS (2 M in THF) (4 mL,8.5 mmol, 4 equiv) at 0° C. drop wise. The reaction mixture was allowedto stir at 80° C. for overnight. Progress of the reaction was monitoredby TLC and LCMS. After completion of the reaction, the reaction mixturewas quenched with saturated solution of NaHCO₃ (50 mL) and extractedwith ethyl acetate (100 mL×2). Organic layer was washed with water (100mL), dried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain6-bromo-8-chloro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine (550mg, 89%) as a transparent oil compound. LCMS: 290 [M+H]⁺

Step-3: Synthesis of8-chloro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine:6-bromo-8-chloro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine (550mg, 1.9 mmol, 1 equiv),4,4,5,5-tetramethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,2-dioxaborolane(725 mg, 2.8 mmol, 1.5 equiv), Potassium acetate (466 mg, 4.7 mmol, 2.5equiv) and dioxane (10 mL) were charged in a 25 mL glass bottle. Purgedthe reaction mixture with nitrogen gas for 15 min, Pd(dppf)Cl2. DCM (78mg, 0.09 mmol, 0.05 equiv) was added to above mixture and the reactionmixture was allowed to stir at 100° C. for 3 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL×2). Organic layer was washed with brine (100 mL) andwater (100 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain8-chloro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(600 mg, 94%) as a dark brown viscous compound. LCMS: 338 [M+H]⁺

Step-4: Synthesis of8-chloro-6-(2-chloro-5-fluoropyrimidin-4-yl)-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine:To a stirred solution of 2,4-dichloro-5-fluoropyrimidine (150 mg, 0.9mmol, 1 equiv) in THF: Water (1:1=10 mL) was added8-chloro-4-isopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(305 mg, 0.9 mmol, 1 equiv), Potassium carbonate (248 mg, 1.8 mmol, 2equiv) and Pd(PPh₃)₄ (52 mg, 0.04 mmol, 0.05 equiv). The reactionmixture was allowed to stir at 80° C. for 3 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brine(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound, which waspurified by normal phase combi-flash to obtain8-chloro-6-(2-chloro-5-fluoropyrimidin-4-yl)-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(300 mg, 81%) as a yellow solid compound. LCMS: 342 [M+H]⁺

Step-5: Synthesis of tert-butyl4-(4-((4-(8-chloro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)-2-fluorophenyl)piperazine-1-carboxylate:To a solution of8-chloro-6-(2-chloro-5-fluoropyrimidin-4-yl)-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.29 mmol, 1 equiv) in Dioxane (10 mL), was added tert-butyl4-(4-amino-2-fluorophenyl)piperazine-1-carboxylate (95 mg, 0.32 mmol,1.1 equiv) and cesium carbonate (142 mg, 0.43 mmol, 1.5 equiv). Thereaction mixture was purged with nitrogen gas for 30 min, followed bythe addition of palladium acetate (1.3 mg, 0.005 mmol, 0.02 equiv) andBINAP (7 mg, 0.01 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brine(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound, which waspurified by reverse phase HPLC to obtain tert-butyl4-(4-((4-(8-chloro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)-2-fluorophenyl)piperazine-1-carboxylate(30 mg, 17%) as a yellow solid compound. LCMS: 601 [M+H]⁺

Step-6: Synthesis of4-(8-chloro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)pyrimidin-2-amine:tert-butyl4-(4-((4-(8-chloro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)-2-fluorophenyl)piperazine-1-carboxylate(30 mg, 0.05 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure and the residuewas dried under lyophilizer to obtain4-(8-chloro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)pyrimidin-2-amine(25 mg, 93%) as a brick red color solid compound. LCMS: 501 [M+H]⁺;¹HNMR (400 MHz, DMSO-d6) δ 9.82 (s, 1H), 9.18 (s, 1H), 8.58 (d, J=3.8Hz, 1H), 7.81 (dd, J=15.0,2.5 Hz, 1H), 7.51 (s, 1H), 7.39 (dd, J=8.7,2.3 Hz, 1H), 7.36 (s, 1H), 7.04 (t, J=9.3 Hz, 1H), 4.33 (d, J=4.0 Hz,2H), 4.16 (p, J=6.7 Hz, 1H), 3.31 (t, J=4.2 Hz, 2H), 3.23 (q, J=4.3 Hz,4H), 3.20-3.13 (m,4H), 1.19 (d, J=6.5 Hz, 6H).

Example-48 Synthesis of2-(dimethylamino)-1-(4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazin-1-yl)ethan-1-one.(Compound 440)

Step-1: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-(piperazin-1-yl)phenyl)pyrimidin-2-amine:A solution of tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazine-1-carboxylate(110 mg, 0.19 mmol, 1 equiv) in 1.25 M HCl in ethanol (4 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-(piperazin-1-yl)phenyl)pyrimidin-2-amine(70 mg) as an oily residue. LCMS: 467 [M+H]⁺

Step-2: Synthesis of2-(dimethylamino)-1-(4-(4-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazin-1-yl)ethan-1-one:To a solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-(piperazin-1-yl)phenyl)pyrimidin-2-amine(70 mg, 0.15 mmol, 1 equiv) in DMF (4 mL) was added dimethyl glycine (24mg, 0.22 mmol, 1.5 equiv) followed by addition of HATU (84 mg, 0.22mmol, 1.5 equiv) and DIPEA (48 mg, 0.37 mmol, 2.5 equiv). Resultantmixture was allowed to stir at room temperature for 2 h. Progress of thereaction was monitored by LCMS. After completion of the reaction, thereaction mixture was diluted with water (10 mL) and extracted with EtOAc(15 mL). Organic layer was washed with water (50 mL×6) and brine (50mL), dried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain crude compound was purified by reverse phase HPLC toafford2-(dimethylamino)-1-(4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazin-1-yl)ethan-1-one(10 mg) as a pale yellow solid. LCMS: 552 [M+H]⁺; ¹HNMR (400 MHz,DMSO-d6) δ 9.45 (s, 1H), 8.50 (d, J=4.0 Hz, 1H), 8.34 (s, 1H), 7.60 (d,J=8.5 Hz, 2H), 7.43 (s, 1H), 7.15 (d, J=11.6 Hz, 1H), 6.91 (d, J=8.5 Hz,2H), 4.29 (t, J=4.3 Hz, 2H), 4.13 (p, J=6.6 Hz, 1H), 3.68 (t, J=4.9 Hz,2H), 3.59 (t, J=4.9 Hz, 2H), 3.30 (t, J=4.4 Hz, 2H), 3.10 (s, 2H), 3.06(t, J=4.9 Hz, 2H), 3.03 (d, J=5.5 Hz, 2H), 2.19 (s, 6H), 1.19 (d, J=6.5Hz, 6H).

Example-49 Synthesis of2-(dimethylamino)-1-(4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazin-1-yl)ethan-1-one.(Compound 441)

Step-1: Synthesis tert-butyl 4-(6-nitropyridin-3-yl)piperazine-1-carboxylate: To a stirred solution of5-bromo-2-nitropyridine (1500 mg, 7.4 mmol, 1 equiv) in DMSO (10 mL),was added K₂CO₃ (1532 mg, 11.1 mmol, 1 equiv), water (5 mL) andtert-butyl piperazine-1-carboxylate (2072 mg, 11.1 mmol, 1 equiv). Theresultant reaction mixture was allowed to stir at 100° C. for overnight.Progress of the reaction was monitored by LCMS. After completion of thereaction, diluted with water (100 mL), solid observed was filtered anddried under vacuum to obtain tert-butyl4-(6-nitropyridin-3-yl)piperazine-1-carboxylate (1800 mg, 79%) as ayellow solid compound. LCMS: 309 [M+H] +

Step-2: Synthesis of tert-butyl 4-(6-aminopyridin-3-yl)piperazine-1-carboxylate: To a stirred solution of tert-butyl4-(6-nitropyridin-3-yl)piperazine-1-carboxylate (500 mg, 1.6 mmol, 1equiv) in ethanol (8 mL), water (2 mL), was added iron powder (269 mg,4.8 mmol, 3 equiv) and ammonium chloride (173 mg, 3.2 mmol, 2 equiv).The resultant reaction mixture was allowed to stir at 90° for 1 h.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the mixture was passes through celite bed and thefiltrate was concentrated under reduced pressure to obtain tert-butyl4-(6-aminopyridin-3-yl) piperazine-1-carboxylate (350 mg, 78%) as a darkbrown solid compound. LCMS: 279 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(150 mg, 0.46 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(6-aminopyridin-3-yl) piperazine-1-carboxylate (141 mg, 0.5 mmol, 1.1equiv) and cesium carbonate (225 mg, 0.69 mmol, 1.5 equiv). The reactionmixture was degassed with nitrogen gas for 30 min, followed by theaddition of palladium acetate (2 mg, 0.009 mmol, 0.02 equiv) and BINAP(12 mg, 0.018 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phaseCombi flash to obtain tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazine-1-carboxylate(100 mg, 38%) as a yellow color solid compound. LCMS: 568 [M+H]⁺

Step-4: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine:tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazine-1-carboxylate(100 mg, 0.17 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure and the residuewas dried under lyophilizer to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine(85 mg, 97%) as a brown solid compound. LCMS: 468 [M+H]⁺

Step-5: Synthesis of2-(dimethylamino)-1-(4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazin-1-yl)ethan-1-one:To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine(70 mg, 0.13 mmol, 1 equiv) in DMF (5 mL), was added dimethylglycine (17mg, 0.16 mmol, 1.2 equiv), DIPEA (0.09 mL, 0.52 mmol, 4 equiv) and HATU(89 mg, 0.23 mmol, 1.8 equiv). The reaction mixture was allowed to stirfor overnight at RT. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, the reaction mixture was dilutedwith water (10 mL) and extracted with ethyl acetate (30 mL×2). Organiclayer was washed with water (50 mL), brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude compound, which was purified by reversephase HPLC to obtain2-(dimethylamino)-1-(4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazin-1-yl)ethan-1-one(25 mg, 32%) as yellow color solid compound. LCMS: 553 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 9.71 (s, 1H), 8.56 (d, J=4.0 Hz, 1H), 8.07-8.00 (m,2H), 7.46 (s,1H), 7.42 (dd, J=9.2,3.0 Hz, 1H), 7.17 (d, J=11.5 Hz, 1H),4.30 (t, J=4.2 Hz, 2H), 4.15 (p, J=6.6 Hz, 1H), 3.70 (t, J=4.8 Hz, 2H),3.61 (t, J=5.3 Hz, 2H), 3.23 (t, J=4.8 Hz, 2H), 3.16-3.04 (m, 6H), 2.19(s, 6H),1.19 (d, J=6.5 Hz, 6H).

Example-50 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine.(Compound442)

Step-1: Synthesis of tert-butyl 6-nitro-3′,6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate: To a solution of5-bromo-2-nitropyridine (10 g, 49 mmol, 1 equiv) in dioxane (90 mL) andwater (10 mL), was added tert-butyl4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydropyridine-1(2H)-carboxylate (15.23 g,49 mmol, 1 equiv). Sodiumcarbonate (15.58 g, 147 mmol, 3 eq.) was added to reaction mixture atambient temperature and nitrogen was purged for 15 minutes. Pd(PPh₃)₂Cl₂(343 mg, 0.49 mmol, 1 mol%) was added and nitrogen was again purged for10 minutes . Reaction mixture was heated at 100° C. for 16 h. TLC (50%ethyl acetate: hexane) showed that starting material was consumed. Aftercompletion of reaction, solvent was removed under reduced pressure.Ethyl acetate (1000 mL) was added to reaction mixture and organic phasewas separated. Ethyl acetate layer was washed with water (200 mL×3),dried over anhydrous sodium sulphate, filtered and concentrated underreduced pressure to afford crude. Crude product was purified byCombi-Flash to afford tert-butyl 6-nitro-3′,6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate (10.2 g , 67.5%) aswhite solid. LCMS: 276 [M+H]⁺

Step-2: Synthesis of tert-butyl tert-butyl4-(6-aminopyridin-3-yl)piperidine-1-carboxylate: To a stirred solutionof tert-butyl 6-nitro-3′,6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate (10.2 g, 33.4 mmol, 1equiv) in ethanol (400 mL), was added Pd/C (10% w/w, 2 g).

The resultant reaction mixture was stir at ambient temperature for 2 hunder hydrogen balloon. TLC (50% EA: hexane) showed that startingmaterial was consumed. After completion of the reaction, the mixture waspasses through celite bed which was washed with ethanol (100 mL×2).Filtrate was concentrated under reduced pressure to afford tert-butyltert-butyl 4-(6-aminopyridin-3-yl)piperidine-1-carboxylate (10 g, >100%)as a transparent oil. LCMS: 278 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(10.6 g, 32 mmol, 1 equiv) in dioxane (160 mL), was added tert-butyl4-(5-aminopyridin-2-yl) piperidine-1-carboxylate (10 g, 36 mmol, 1.1equiv) and cesium carbonate (20.8 g, 64 mmol, 2 equiv) and nitrogen waspurged for 15 minutes. Palladium acetate (2 mg, 0.009 mmol, 0.02 equiv)and BINAP (12 mg, 0.018 mmol, 0.04 equiv) were added and nitrogen wasagain purged for 10 minutes. Reaction mixture was heated at 100° C. for16 h. TLC (50% ethyl acetate: hexane) showed that starting material wasconsumed. After completion of reaction, solvent was removed underreduced pressure. Ethyl acetate (1000 mL) was added to reaction mixtureand organic phase was separated. Ethyl acetate layer was washed withwater (200 mL×3), dried over anhydrous sodium sulphate, filtered andconcentrated under reduced pressure to afford crude. Crude product waspurified by Combi-Flash using 0-40% ethyl acetate: Hexane to affordtert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidine-1-carboxylate(7 g, 38%) as a yellow solid compound. LCMS: 567 [M+H]⁺

Step-4: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl) -N-(5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-aminehydrochloride: A solution of tert-butyl tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidine-1-carboxylate(7 g, 0.1 mmol, 1 equiv) was charged in ethanol (60 mL) and 4 M HCl inDioxane (40 mL) was added into it. Solution was stirred for 1 h at 50°C. TLC (50% ethyl acetate: hexane) and LCMS showed that startingmaterial was consumed. After completion of the reaction, solvent wasremoved under reduced pressure and basified with saturated NaHCO3 (˜100mL) till pH=7-8. Solid obtained was filtered under vacuum and washedwith water (100 mL×3). Compound was further dried in vacuum to afford5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl) -N-(5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-aminehydrochloride (5.2 g, 90.2%) as a yellow solid. LCMS: 467 [M+H]⁺

Step-5: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine:To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-(piperidin-4-yl)pyridin-3-yl)pyrimidin-2-amine(4 g, 8.56 mmol, 1 equiv) in DCE (40 mL), was added Formaldehyde (40% inwater) (2.31 g, 77.04 mmol, 9 equiv), acetic acid (2.57 g, 42.8 mmol, 5equiv). The reaction mixture was stirred at ambient temperature for 1 h.The reaction mixture was cooled to 0° C. NaCNBH₃ (1.61 g, 25.68 mmol, 3equiv) was added to above mixture and reaction mixture was allowed tocome at ambient temperature. The reaction mixture was stirred at ambienttemperature for 2 h. TLC (10% MeOH: DCM) and LCMS showed that startingmaterial was consumed. After completion, the reaction mixture wasdiluted with water (50 mL) and concentrated under reduced pressure.Saturated bicarbonate solution (100 mL) was added in to crude materialand solid obtained was filtered under vacuum. Crude material waspurified by silica gel chromatography (#100-200) using 0-7% MeOH: DCM toafford free base of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine(1.42 g, 34.5%) as a yellow solid. LCMS: 481 [M+H]⁺

Step-6: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-aminehydrochloride : In 250 mL RBF,5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-aminefree base (1.41 g, 2.93 mmol, leq.) was suspended in ethanol (100 mL)and heated to reflux till the suspension became clear solution. Reactionmixture was cooled to ambient temperature. Hydrochloric acid, 35% (611mg, 5.86 mmol, 2 eq.) dissolved in ethanol (10 mL) was added to reactionmixture drop wise at ambient temperature. Reaction mixture was stirredat same temperature for 30 minutes. Reaction mixture was concentratedunder reduced pressure. MTBE (100 mL) was added to reaction mixture andsolid obtained was filtered under vacuum. Solid compound was washed withMethyl tert butyl ether (100 mL) and dried in vacuum oven at 55° C. for16 h to afford5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-aminehydrochloride salt of tittle compound (1.57 g, 96.9%) as yellow solid.LCMS: 481 [M+1]⁺; ¹H NMR (400 MHz, DMSO-d6, HCl salt): δ 10.61 (br. s,1H), 8.75 (d, J=3.51 Hz, 1H), 8.24 (s, 1H), 8.01 (s, 1H), 7.92 (d,J=8.77 Hz, 1H), 7.44 (s, 1H), 7.22 (d, J=11.40 Hz, 1H), 4.31 (s, 2H),4.06-4.23 (m, 1H), 3.50 (d, J=12.28 Hz, 2H), 3.32 (m, 2H), 3.06 (m, 1H),2.90 (m, 3H), 2.77 (m, 2H), 2.03 (m, 2H), 1.97 (m, 2H), 1.20 (d, J=6.58Hz, 6H); UPLC-LCMS: 99.93%; HPLC:99.05%

Example-51 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-fluoro-5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine.(Compound443)

Step-1: Synthesis of tert-butyl 6-amino-4-fluoro-3′,6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate: To a solution of5-bromo-4-fluoropyridin-2-amine (500 mg, 2.6 mmol, 1 equiv) in dioxane(10 mL), was added tert-butyl4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydropyridine-1(2H)-carboxylate(809 mg, 2.6 mmol, 1 equiv) and sodium bicarbonate (655 mg, 7.8 mmol, 3equiv). The reaction mixture was degassed with nitrogen gas for 30 min,followed by the addition of Pd (PPh₃)₄ (150 mg, 0.13 mmol, 0.05 equiv).The resultant reaction mixture was allowed to stir at 100° C. forovernight. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, reaction mixture was diluted with water (30mL) and extracted with ethyl acetate (100 mL×2). Organic layer waswashed with water (100 mL) and brine solution (100 mL). Organic layerwas dried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain crude, which was purified by normal phase combi flashto obtain tert-butyl 6-amino-4-fluoro-3′,6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate (600 mg, 78%) as ayellow oil compound. LCMS: 294 [M+H]⁺

Step-2: Synthesis of tert-butyl 4-(6-amino-4-fluoropyridin-3-yl)piperidine-1-carboxylate: To a stirred solution of tert-butyl6-amino-4-fluoro-3′, 6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate(300 mg, 1.02 mmol, 1 equiv) in methanol (10 mL), was added Pd/C (20%w/w) (60 mg) under H₂ atm. The resultant reaction mixture was allowed tostir at RT for overnight. Progress of the reaction was monitored byLCMS. After completion of the reaction, the mixture was passes throughcelite bed and the filtrate was concentrated under reduced pressure toobtain tert-butyl 4-(6-amino-4-fluoropyridin-3-yl)piperidine-1-carboxylate (150 mg, 50%) as a white solid compound. LCMS:296 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(4-fluoro-6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(6-amino-4-fluoropyridin-3-yl) piperidine-1-carboxylate (97 mg, 0.33mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to obtain tert-butyl4-(4-fluoro-6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidine-1-carboxylate(17 mg, 9%) as a yellow solid compound. LCMS: 585 [M+H]⁺

Step-4: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-fluoro-5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine:A solution of tert-butyl4-(4-fluoro-6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidine-1-carboxylate(17 mg, 0.02 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-fluoro-5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine(13 mg, 87%) as a yellow solid compound. LCMS: 485 [M+H]⁺ ¹HNMR (400MHz, DMSO-d₆) δ 10.48 (s, 1H), 8.86 (d, J=11.2 Hz, 1H), 8.69 (d, J=3.8Hz, 1H), 8.21 (d, J=10.6 Hz, 1H), 8.08 (d, J=13.6 Hz, 1H), 7.48 (s, 1H),7.19 (d, J=11.6 Hz, 1H), 4.31 (t, J=4.2 Hz, 2H), 4.19 (p, J=6.7 Hz, 1H),3.37 (d, J=12.5 Hz, 1H), 3.32 (t, J=4.4 Hz,2H), 3.06 (dt, J=19.1, 8.9Hz, 4H), 2.01-1.90 (m, 4H), 1.19 (d, J=6.5 Hz,6H).

Example-52 Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-5-methyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazin-2-amine.(Compound 444)

To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added5-methyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazin-2-amine (97 mg, 0.33mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified byrecrystallization with methanol to obtainN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-5-methyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazin-2-amine(30 mg, 22%) as a yellow solid compound. LCMS: 442 [M+H]⁺;¹HNMR (400MHz, DMSO-d₆) δ 9.82 (s, 1H), 8.49 (d, J=4.0 Hz, 1H), 7.45 (s, 1H), 7.15(d, J=11.5 Hz, 1H), 6.41 (s, 1H), 4.30 (t, J=4.3 Hz, 2H), 4.12 (dq,J=10.1, 5.3,4.6 Hz, 1H), 3.96 (t, J=5.4 Hz,2H), 3.54 (s, 2H), 3.25 (s,2H), 2.83 (t, J=5.5 Hz, 2H), 2.38 (s, 3H), 1.19 (d, J=6.5 Hz, 6H).

Example-53 Synthesis of1-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperidin-4-ol.(Compound445)

Step-1: Synthesis of 1-(2-fluoro-4-nitrophenyl) piperidin-4-ol: To astirred solution of 1,2-difluoro-4-nitrobenzene (1000 mg, 6.28 mmol, 1equiv) in methanol (15 mL), was added TEA (1.7 mL, 9.43 mmol, 2 equiv)and piperidin-4-ol (953 mg, 12.5 mmol, 1.5 equiv). The resultantreaction mixture was allowed to stir at 60° C. for overnight. Progressof the reaction was monitored by LCMS. After completion of the reaction,diluted with water (100 mL), solid observed was filtered and dried undervacuum to obtain 1-(2-fluoro-4-nitrophenyl)piperidin-4-ol (1300 mg, 86%)as a yellow solid compound. LCMS: 241 [M+H]⁺

Step-2: Synthesis of 1-(4-amino-2-fluorophenyl) piperidin-4-ol: To astirred solution of 1-(2-fluoro-4-nitrophenyl)piperidin-4-ol (500 mg,2.08 mmol, 1 equiv) in ethanol (8 mL), water (2 mL), was added ironpowder (350 mg, 6.25 mmol, 3 equiv) and ammonium chloride (225 mg, 4.16mmol, 2 equiv). The resultant reaction mixture was allowed to stir at90° for 1 h. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, the mixture was passes through celitebed and the filtrate was concentrated under reduced pressure to obtain1-(4-amino-2-fluorophenyl) piperidin-4-ol (350 mg, 80%) as a dark brownsolid compound. LCMS: 211 [M+H]⁺

Step-3: Synthesis of1-(2-fluoro-4-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperidin-4-ol:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine (100 mg, 0.3mmo1, 1 equiv) in dioxane (10 mL), was added1-(4-amino-2-fluorophenyl)piperidin-4-ol (69 mg, 0.33 mmol, 1.1 equiv)and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv). The reactionmixture was degassed with nitrogen gas for 30 min, followed by theaddition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP(8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified byrecrystallization with methanol to obtain1-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperidin-4-ol(70 mg, 45%) as a yellow color solid compound. LCMS: 500 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 9.72 (s, 1H), 8.56 (d, J=4.0 Hz, 1H), 7.71 (dd,J=15.2, 2.5 Hz, 1H),7.43 (s, 1H), 7.35 (dd, J=8.9, 2.4 Hz, 1H), 7.16 (d,J=11.5 Hz, 1H), 6.97 (t, J=9.4 Hz, 1H), 4.68 (d, J=4.1 Hz, 1H),4.33-4.26 (m, 2H), 4.15 (h, J=6.7 Hz, 1H), 3.58 (tt, J=8.5, 4.3 Hz, 1H),3.31 (s, 2H),3.16 (dt, J=10.0, 4.4 Hz, 2H), 2.71 (d, J=9.5 Hz, 2H), 1.83(dt, J=12.2,4.2 Hz, 2H), 1.61-1.47 (m,2H), 1.18 (d, J=6.4 Hz, 6H).

Example-54 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-morpholinopyridin-2-yl)pyrimidin-2-amine.(Compound 446)

Step-1: Synthesis of 4-(6-nitropyridin-3-yl) morpholine: To a stirredsolution of 5-bromo-2-nitropyridine (500 mg, 2.47 mmol, 1 equiv) in DMSO(10 mL), was added TEA (0.7 mL, 4.94 mmol, 2 equiv) and morpholine (323mg, 3.7 mmol, 1.5 equiv). The resultant reaction mixture was allowed tostir at 100° C. for overnight. Progress of the reaction was monitored byTLC and LCMS. After completion of the reaction, diluted with water (100mL), solid observed was filtered and dried under vacuum to obtain4-(6-nitropyridin-3-yl)morpholine (500 mg, 97%) as a yellow solidcompound. LCMS: 210 [M+H]⁺

Step-2: Synthesis of 5-morpholinopyridin-2-amine: To a stirred solutionof 4-(6-nitropyridin-3-yl)morpholine (500 mg, 2.39 mmol, 1 equiv) inethanol (8 mL), water (2 mL), was added iron powder (402 mg, 7.17 mmol,3 equiv) and ammonium chloride (258 mg, 4.78 mmol, 2 equiv). Theresultant reaction mixture was allowed to stir at 90° for 1 h. Progressof the reaction was monitored by TLC and LCMS. After completion of thereaction, the mixture was passes through celite bed and the filtrate wasconcentrated under reduced pressure to obtain5-morpholinopyridin-2-amine (300 mg, 70%) as a dark brown solidcompound. LCMS: 180 [M+H]⁺

Step-3: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-morpholinopyridin-2-yl)pyrimidin-2-amine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3mmo1, 1 equiv) in dioxane (10 mL), was added5-morpholinopyridin-2-amine (59 mg, 0.33 mmol, 1.1 equiv) and cesiumcarbonate (147 mg, 0.47mmo1, 1.5 equiv). The reaction mixture wasdegassed with nitrogen gas for 30 min, followed by the addition ofpalladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP (8 mg, 0.012mmol, 0.04 equiv). The resultant reaction mixture was allowed to stir at100° C. for overnight. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, diluted with water (30 mL) andextracted with ethyl acetate (100 mL). Organic layer was washed withwater (50 mL) and brine solution (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by reverse phase HPLC to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-morpholinopyridin-2-yl)pyrimidin-2-amine(40 mg, 28%) as a yellow color solid compound. LCMS: 469 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 8.53 (d, J=3.9 Hz, 1H), 8.00 (d, J=9.3 Hz, 2H),7.42 (s, 1H), 7.38(dd, J=9.1,3.1 Hz, 1H), 7.15 (d, J=11.7 Hz, 1H),4.31-4.24 (m, 2H), 4.11 (p, J=6.6 Hz, 1H), 3.74 (t,J=4.7 Hz, 4H), 3.28(t, J=4.3 Hz, 2H), 3.07 (t, J=4.8 Hz, 4H), 1.16 (d, J=6.5 Hz, 6H).

Example-55 Synthesis of1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-ol.(Compound 447)

Step-1: Synthesis of 1-(6-nitropyridin-3-yl) piperidin-4-ol: To astirred solution of 5-bromo-2-nitropyridine (1000 mg, 4.95 mmol, 1equiv) in DMSO (15 mL), was added K₂CO₃ (1366 mg, 9.9 mmol, 2 equiv) andpiperidin-4-ol (750 mg, 7.42 mmol, 1.5 equiv). The resultant reactionmixture was allowed to stir at 100° C. for overnight. Progress of thereaction was monitored by LCMS. After completion of the reaction,diluted with water (100 mL), solid observed was filtered and dried undervacuum to obtain 1-(6-nitropyridin-3-yl)piperidin-4-ol (900 mg, 82%) asa yellow solid compound. LCMS: 224 [M+H]⁺

Step-2: Synthesis of 1-(6-aminopyridin-3-yl) piperidin-4-ol: To astirred solution of 1-(6-nitropyridin-3-yl)piperidin-4-ol (500 mg, 2.24mmol, 1 equiv) in ethanol (8 mL), water (2 mL), was added iron powder(377 mg, 6.72 mmol, 3 equiv) and ammonium chloride (242 mg, 4.48 mmol, 2equiv). The resultant reaction mixture was allowed to stir at 90° for 1h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the mixture was passes through celite bedand the filtrate was concentrated under reduced pressure to obtain1-(6-aminopyridin-3-yl)piperidin-4-ol (350 mg, 81%) as a dark brownsolid compound. LCMS: 194 [M+H]⁺

Step-3: Synthesis of1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-ol:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3mmo1, 1 equiv) in dioxane (10 mL), was added1-(6-aminopyridin-3-yl)piperidin-4-ol (64 mg, 0.33 mmol, 1.1 equiv) andcesium carbonate (147 mg, 0.47 mmol, 1.5 equiv). The reaction mixturewas degassed with nitrogen gas for 30 min, followed by the addition ofpalladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP (8 mg, 0.012mmol, 0.04 equiv). The resultant reaction mixture was allowed to stir at100° C. for overnight. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, diluted with water (30 mL) andextracted with ethyl acetate (100 mL). Organic layer was washed withwater (50 mL) and brine solution (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by recrystallization with methanol toobtain1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-ol(20 mg, 14%) as a yellow color solid compound. LCMS: 483 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 8.69 (d, J=3.6 Hz, 1H), 8.00-7.91 (m, 1H), 7.88 (d,J=3.0 Hz, 1H),7.70 (d, J=9.3 Hz, 1H), 7.38 (s, 1H), 7.19 (d, J=11.4 Hz,1H), 4.29 (t, J=4.2 Hz, 2H), 4.12 (p, J=6.6 Hz, 1H), 3.67 (p, J=6.8, 6.1Hz, 3H), 3.30 (t, J=4.2 Hz, 2H), 2.95 (t, J=10.7 Hz, 2H), 1.85 (dd,J=12.8, 4.9 Hz, 2H), 1.51 (dtd, J=13.1, 9.0, 3.8 Hz, 2H), 1.17 (d, J=6.5Hz, 6H).

Example-56 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(1-(piperidin-4-yl)-1H-pyrazol-4-yl)pyrimidin-2-amine.(Compound 448)

Step-1: Synthesis of tert-butyl 4-(4-nitro-1H-pyrazol-1-yl)piperidine-1-carboxylate: To a stirred solution of tert-butyl4-bromopiperidine-1-carboxylate (1000 mg, 8.7 mmol, 1 equiv) in DMF (15mL), was added Cs₂CO₃ (5672 mg, 17.4 mmol, 1 equiv) and4-nitro-1H-pyrazole (2693 mg, 10.2 mmol, 1.2 equiv). The resultantreaction mixture was allowed to stir at 120° C. for overnight. Progressof the reaction was monitored by TLC and LCMS. After completion of thereaction, diluted with water (100 mL) and extracted with ethyl acetate(150 mL×2). Organic layer was washed with water (100 mL) and brinesolution (100 mL). Organic layer was dried over anhydrous sodiumsulphate and concentrated under reduced pressure to obtain crude, whichwas purified by normal phase combi flash to obtain tert-butyl4-(4-nitro-1H-pyrazol-1-yl)piperidine-1-carboxylate (2500 mg, 96%) as awhite solid compound. LCMS: 241 [M-t-But+H]⁺

Step-2: Synthesis of tert-butyl 4-(4-amino-1H-pyrazol-1-yl)piperidine-1-carboxylate: To a stirred solution of tert-butyl4-(4-nitro-1H-pyrazol-1-yl)piperidine-1-carboxylate (1000 mg, 3.37 mmol,1 equiv) in ethanol (10 mL), water (3 mL), was added iron powder (566mg, 10.11 mmol, 3 equiv) and ammonium chloride (364 mg, 6.74 mmol, 2equiv). The resultant reaction mixture was allowed to stir at 90° for 1h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the mixture was passes through celite bedand the filtrate was concentrated under reduced pressure to obtaintert-butyl 4-(4-amino-1H-pyrazol-1-yl) piperidine-1-carboxylate (400 mg,44%) as a dark brown solid compound. LCMS: 267 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1H-pyrazol-1-yl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(4-amino-1H-pyrazol-1-yl) piperidine-1-carboxylate (88 mg, 0.33 mmol,1.1 equiv) and cesium carbonate (147 mg, 0.47mmo1, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtain tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1H-pyrazol-1-yl)piperidine-1-carboxylate(20 mg, 12%) as a yellow color solid compound. LCMS: 556 [M+H]⁺

Step-4: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(1-(piperidin-4-yl)-1H-pyrazol-4-yl)pyrimidin-2-amine:tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1H-pyrazol-1-yl)piperidine-1-carboxylate(mg, mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL) and theresultant reaction mixture was allowed to stir at 50° C. for 1 h.Progress of the reaction was monitored by LCMS. After completion of thereaction, solvent was removed under reduced pressure and the residue wasdried under lyophilizer to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(1-(piperidin-4-yl)-1H-pyrazol-4-yl)pyrimidin-2-amine(15 mg, 83%) as an orange color solid compound. LCMS: 456 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 9.53 (s, 1H), 8.50 (d, J=3.9 Hz, 1H), 7.88 (s, 1H),7.64 (s, 1H), 7.34 (s, 1H), 7.13 (d, J=11.6 Hz, 1H), 4.44 (tt,J=10.0,5.1 Hz, 1H), 4.30 (t, J=4.3 Hz, 2H), 4.12 (p, J=6.6 Hz, 1H), 3.39(d, J=12.7 Hz, 2H), 3.31 (t, J=4.3 Hz, 2H), 3.04 (q, J=11.1 Hz, 2H),2.14 (tt, J=11.0, 5.2 Hz, 4H), 1.18 (d, J=6.5 Hz, 6H).

Example-57 Synthesis of2-(dimethylamino)-1-(4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazin-1-yl)ethan-1-one.(Compound 449)

To a solution of5-fluoro-N-(3-fluoro-4-(piperazin-1-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-aminehydrochloride (50 mg, 0.1 mmol, 1 equiv) in DMF (3 mL) was addeddimethyl glycine (16 mg, 0.15 mmol, 1.5 equiv) followed by addition ofHATU (57 mg, 0.15 mmol, 1.5 equiv) and DIPEA (33 mg, 0.25 mmol, 2.5equiv). Resultant mixture was allowed to stir at room temperature for 2h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, the reaction mixture was diluted with water (10 mL) andextracted with EtOAc (12 mL). Organic layer was washed with water (5mL×6) and brine (5 mL), dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound waspurified by reverse phase HPLC to afford2-(dimethylamino)-1-(4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperazin-1-yl)ethan-1-one(30 mg) as a pale yellow solid. LCMS: 570 [M+H]⁺; ¹HNMR (400 MHz,DMSO-d6) δ 9.76 (s, 1H), 8.57 (d, J=3.9 Hz, 1H), 7.77 (dd, J=15.0, 2.5Hz, 1H),7.43 (s, 1H), 7.41-7.34 (m, 1H), 7.16 (d, J=11.8 Hz, 1H), 6.99(t, J=9.4 Hz, 1H), 4.34-4.27 (m, 2H),4.16 (p, J=6.7 Hz, 1H), 3.67 (s,2H), 3.60 (t, J=5.0 Hz, 2H), 3.22 (s, 2H), 2.93 (dt, J=18.9, 5.3 Hz,8H),2.25 (s, 6H), 1.19 (d, J=6.5 Hz, 6H).

Example-58 Synthesis of2-(dimethylamino)-1-(4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-1-yl)ethan-1-one.(Compound 450)

Step-1: Synthesis of2-(dimethylamino)-1-(4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-1-yl)ethan-1-one:To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine(160 mg, 0.31 mmol, 1 equiv) in DMF (3 mL), was added dimethylglycine(39 mg, 0.38 mmol, 1.2 equiv), DIPEA (0.2 mL, 1.24 mmol, 4 equiv) andHATU (212 mg, 0.55 mmol, 1.8 equiv). The reaction mixture was allowed tostir for 3 h at RT. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, the reaction mixture was dilutedwith water (10 mL), solid observed was filtered and purified byrecrystallization with methanol to obtain2-(dimethylamino)-1-(4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-1-yl)ethan-1-one(100 mg, 65%) as an off white color solid compound. LCMS: 552 [M+H]⁺;¹HNMR (400 MHz, DMSO-d6) δ 9.92 (s, 1H), 8.61 (d, J=3.8 Hz, 1H), 8.20(d, J=2.5 Hz, 1H), 8.14 (d, J=8.6 Hz, 1H), 7.61 (dd, J=8.6, 2.6 Hz, 1H),7.47 (s, 1H), 7.19 (d, J=11.8 Hz, 1H),4.52 (d, J=13.0 Hz, 1H), 4.30 (t,J=4.3 Hz, 2H), 4.16 (p, J=6.4 Hz, 1H), 3.86 (d, J=14.0 Hz, 2H), 3.39 (d,J=12.7 Hz, 2H), 3.15 (dd, J=15.7, 9.1 Hz, 1H), 2.93-2.67 (m, 3H), 2.62(s, 6H), 1.90-1.81 (m, 2H), 1.64 (t, J=12.2 Hz, 1H), 1.57-1.43 (m, 1H),1.19 (d, J=6.5 Hz, 6H).

Example-59 Synthesis of2-(dimethylamino)-1-(4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)arnino)phenyl)piperidin-1-yl)ethan-1-one.(Compound 451)

Step-1: Synthesis of2-(dimethylamino)-1-(4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperidin-1-yl)ethan-1-one:To a stirred solution of5-fluoro-N-(3-fluoro-4-(piperidin-4-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(180 mg, 0.34 mmol, 1 equiv) in DMF (3 mL), was added dimethyl glycine(43 mg, 0.41 mmol, 1.2 equiv), DIPEA (0.2 mL, 1.24 mmol, 4 equiv) andHATU (233 mg, 0.61 mmol, 1.8 equiv). The reaction mixture was allowed tostir for 3 h at RT. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction the reaction mixture was dilutedwith water (10 mL), solid observed was filtered and purified by reversephase HPLC to obtain2-(dimethylamino)-1-(4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperidin-1-yl)ethan-1-one(40 mg, 23%) as a yellow color solid compound. LCMS: 569 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 9.87 (s, 1H), 8.59 (d, J=3.9 Hz, 1H), 7.76 (dd,J=13.6, 2.1 Hz, 1H),7.45 (s, 1H), 7.40 (dd, J=8.7, 2.2 Hz, 1H),7.23-7.12 (m, 2H), 4.50 (d, J=12.1 Hz, 1H), 4.33-4.26(m, 2H), 4.17 (dd,J=12.9, 6.5 Hz, 2H), 3.34-3.27 (m, 2H), 3.07 (dq, J=45.8, 11.8, 10.5 Hz,4H), 2.61(d, J=12.4 Hz, 1H), 2.19 (s, 6H), 1.79-1.70 (m, 2H), 1.61 (dt,J=14.4, 7.3 Hz, 1H), 1.49 (td, J=12.5,4.3 Hz, 1H), 1.18 (d, J=6.5 Hz,6H).

Example-60 Synthesis of4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)arnino)-1H-pyrazol-1-yl)cyclohexan-1-ol.(Compound 452)

Step-1: Synthesis of 4-oxocyclohexyl methanesulfonate: To a stirredsolution of 4-hydroxycyclohexan-1-one (1000 mg, 8.7 mmol, 1 equiv) inDCM (15 mL), was added TEA (1.2 mL, 8.7mmo1, 1 equiv). Cool the reactionmixture to 0° C, followed by the addition of mesyl chloride (0.7 mL, 8.7mmol, 1 equiv). Raise the temp. To RT and the resultant reaction mixturewas allowed to stir for overnight. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, diluted with water(50 mL) and extracted with DCM (100 mL×2). Organic layer was washed withwater (100 mL) and brine solution (100 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain 4-oxocyclohexyl methanesulfonate (1300 mg, 77%) as a yellow oilcompound.

Step-2: Synthesis of 4-(4-nitro-1H-pyrazol-1-yl) cyclohexan-1-one: To astirred solution of 4-oxocyclohexyl methanesulfonate (600 mg, 5.3 mmol,1 equiv) in DMF (10 mL), was added K₂CO₃ (1463 mg, 10.6mmo1,2 equiv) and4-nitro-1H-pyrazole (1223 mg, 6.37 mmol, 1.2 equiv). The resultantreaction mixture was allowed to stir at 80° C. for overnight. Progressof the reaction was monitored by LCMS. After completion of the reaction,diluted with water (50 mL) and extracted with EtOAc (100 mL×2). Organiclayer was washed with water (100 mL) and brine solution (100 mL).Organic layer was dried over anhydrous sodium sulphate and concentratedunder reduced pressure to obtain crude, which was purified by normalphase Combi flash to obtain 4-(4-nitro-1H-pyrazol-1-yl)cyclohexan-1-one(400 mg, 36%) as a brown solid compound. LCMS: 210 [M+H]⁺

Step-3: Synthesis of 4-(4-nitro-1H-pyrazol-1-yl) cyclohexan-1-ol: To astirred solution of 4-(4-nitro-1H-pyrazol-1-yl) cyclohexan-1-one (400mg, 1.91 mmol, 1 equiv) in methanol (10 mL), was added NaBH₄ (145 mg,3.82 mmol, 2 equiv) at 0° C. Raise the temp. to RT the resultantreaction mixture was allowed to stir at RT for overnight. Progress ofthe reaction was monitored by TLC and LCMS. After completion of thereaction, solvent was removed under reduced pressure, residue obtain wasdiluted with water (50 mL) and extracted with ethyl acetate (150 mL).Organic layer was washed with water (50 mL) and brine solution (50 mL).Organic layer was dried over anhydrous sodium sulphate and concentratedunder reduced pressure to obtain crude, which was purified by normalphase Combi flash to obtain 4-(4-nitro-1H-pyrazol-1-yl)cyclohexan-1-ol(400 mg, 87%) as an off white solid compound. LCMS: 212 [M+H]⁺

Step-4: Synthesis of 4-(4-amino-1H-pyrazol-1-yl) cyclohexan-1-ol: To astirred solution of 4-(4-nitro-1H-pyrazol-1-yl)cyclohexan-1-ol (300 mg,1.42 mmol, 1 equiv) in ethanol (8 mL), water (2 mL), was added ironpowder (239 mg, 4.26 mmol, 3 equiv) and ammonium chloride (154 mg, 2.84mmol, 2 equiv). The resultant reaction mixture was allowed to stir at90° for 1 h. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, the mixture was passes through celitebed and the filtrate was concentrated under reduced pressure to obtain4-(4-amino-1H-pyrazol-1-yl) cyclohexan-1-ol (350 mg, 78%) as a darkbrown solid. LCMS: 182 [M+H]⁺

Step-5: Synthesis of4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1H-pyrazol-1-yl)cyclohexan-1-ol:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3mmo1, 1 equiv) in dioxane (10 mL), was added4-(4-amino-1H-pyrazol-1-yl)cyclohexan-1-ol (60 mg, 0.33 mmol, 1.1 equiv)and cesium carbonate (147 mg, 0.47mmo1, 1.5 equiv). The reaction mixturewas degassed with nitrogen gas for 30 min, followed by the addition ofpalladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP (8 mg, 0.012mmol, 0.04 equiv). The resultant reaction mixture was allowed to stir at100° C. for overnight. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, diluted with water (30 mL) andextracted with ethyl acetate (100 mL). Organic layer was washed withwater (50 mL) and brine solution (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by recrystallization with methanol toobtain4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1H-pyrazol-1-yl)cyclohexan-1-ol(10 mg, 7%) as a yellow color solid compound. LCMS: 471 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 9.48 (s, 1H), 8.48 (d, J=3.9 Hz, 1H), 7.88 (s, 1H),7.53 (s, 1H), 7.35(s, 1H), 7.13 (d, J=11.6 Hz, 1H), 4.65 (d, J=4.4 Hz,1H), 4.30 (t, J=4.3 Hz, 2H), 4.18-4.00 (m, 2H),3.48 (td, J=10.2, 9.6,4.4 Hz, 1H), 3.39 (d, J=12.7 Hz, 2H), 1.95 (dt, J=25.3, 7.8 Hz, 4H),1.75 (td, J=14.3, 13.7, 7.0 Hz, 2H),1.40-1.25 (m, 2H), 1.18 (d, J=6.5Hz, 6H).

Example-61 Synthesis of4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-N,N-dimethylpiperazine-1-carboxamide.(Compound 453)

Step-1: Synthesis tert-butyl 4-(6-nitropyridin-3-yl)piperazine-1-carboxylate: To a stirred solution of5-bromo-2-nitropyridine (1500 mg, 7.4 mmol, 1 equiv) in DMSO (10 mL),was added K₂CO₃ (1532 mg, 11.1 mmol, 1 equiv), water (5 mL) andtert-butyl piperazine-1-carboxylate (2072 mg, 11.1 mmol, 1 equiv). Theresultant reaction mixture was allowed to stir at 100° C. for overnight.Progress of the reaction was monitored by LCMS. After completion of thereaction, diluted with water (100 mL), solid observed was filtered anddried under vacuum to obtain tert-butyl4-(6-nitropyridin-3-yl)piperazine-1-carboxylate (1800 mg, 79%) as ayellow solid compound. LCMS: 309 [M+H]⁺

Step-2: Synthesis of tert-butyl 4-(6-aminopyridin-3-yl)piperazine-1-carboxylate: To a stirred solution of tert-butyl4-(6-nitropyridin-3-yl)piperazine-1-carboxylate (500 mg, 1.6 mmol, 1equiv) in ethanol (8 mL), water (2 mL), was added iron powder (269 mg,4.8 mmol, 3 equiv) and ammonium chloride (173 mg, 3.2 mmol, 2 equiv).The resultant reaction mixture was allowed to stir at 90° for 1 h.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the mixture was passes through celite bed and thefiltrate was concentrated under reduced pressure to obtain tert-butyl4-(6-aminopyridin-3-yl) piperazine-1-carboxylate (300 mg, 67%) as a darkbrown solid compound. LCMS: 279 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazine-1-carboxylate;To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(6-aminopyridin-3-yl) piperazine-1-carboxylate (97 mg, 0.33 mmol, 1.1equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv). The reactionmixture was degassed with nitrogen gas for 30 min, followed by theaddition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP(8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phaseCombi flash to obtain tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazine-1-carboxylate(100 mg, 57%) as a yellow color solid compound. LCMS: 568 [M+H]⁺

Step-4: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine:tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazine-1-carboxylate(100 mg, 0.17 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure and the residuewas dried under lyophilizer to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine(80 mg, 90%) as a brown solid compound. LCMS: 468 [M+H]⁺

Step-5: Synthesis of4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-N,N-dimethylpiperazine-1-carboxamide:To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine(60 mg, 0.11 mmol, 1 equiv) in DCM (3 mL), was added DIPEA (0.05 mL,0.33 mmol, 3 equiv). Cool the temp to 0° C, followed by the addition ofdimethylcarbamic chloride (0.01 mL, 0.17 mmol, 1.5 equiv). Raise thetemp to RT and the reaction mixture was allowed to stir for 2 h at RT.Progress of the reaction was monitored by LCMS. After completion of thereaction, the reaction mixture was diluted with DCM (30 mL) and washedwith water (30 mL). Organic layer was dried over anhydrous sodiumsulphate and concentrated under reduced pressure to obtain crudecompound, which was purified by reverse phase HPLC to obtain4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-N,N-dimethylpiperazine-1-carboxamide(12 mg, 19%) as a yellow color solid compound. LCMS: 539 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 9.70 (s, 1H), 8.56 (d, J=4.0 Hz, 1H), 8.07-8.00 (m,2H), 7.46 (s,1H), 7.41 (dd, J=9.2,3.0 Hz, 1H), 7.17 (d, J=11.8 Hz, 1H),4.30 (t, J=4.5 Hz, 2H), 4.14 (p, J=6.7 Hz, 1H), 3.27 (q, J=6.6, 5.1 Hz,6H), 3.11 (t, J=5.0 Hz, 4H), 2.78 (s, 6H), 1.19 (d, J=6.5 Hz, 6H).

Example-62 Synthesis of4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-N,N-dimethylpiperidine-1-carboxamide.(Compound 454)

Step-1: Synthesis of4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-N,N-dimethylpiperidine-1-carboxamide:To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine(60 mg, 0.11 mmol, 1 equiv) in DCM (3 mL), was added DIPEA (0.05 mL,0.33 mmol, 3 equiv). Cool the temp to 0° C, followed by the addition ofdimethylcarbamic chloride (0.01 mL, 0.17 mmol, 1.5 equiv). Raise thetemp to RT and the reaction mixture was allowed to stir for 2 h at RT.Progress of the reaction was monitored by LCMS. After completion of thereaction, the reaction mixture was diluted with DCM (30 mL) and washedwith water (30 mL). Organic layer was dried over anhydrous sodiumsulphate and concentrated under reduced pressure to obtain crudecompound, which was purified by reverse phase HPLC to obtain4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-N,N-dimethylpiperidine-1-carboxamide(35 mg, 55%) as a yellow color solid compound. LCMS: 538 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 9.91 (s, 1H), 8.61 (d, J=4.0 Hz, 1H), 8.20 (d,J=2.5 Hz, 1H), 8.12 (d, J=8.6 Hz, 1H), 7.63 (dd, J=8.7, 2.6 Hz, 1H),7.48 (s, 1H), 7.19 (d, J=11.5 Hz, 1H),4.30 (t, J=4.2 Hz, 2H), 4.16 (p,J=6.7 Hz, 1H), 3.66 (d, J=12.7 Hz, 2H), 3.30 (d, J=4.8 Hz, 2H),2.85-2.67 (m, 9H), 1.77 (dd, J=13.0, 4.0 Hz, 2H), 1.60 (qd, J=12.5, 3.9Hz, 2H), 1.19 (d, J=6.5 Hz, 6H).

Example-63 Synthesis of2-(dimethylamino)-1-(7-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinolin-2(1H)-yl)ethan-1-one.(Compound 455)

Step-1: Synthesis of2-(dimethylamino)-1-(7-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinolin-2(1H)-yl)ethan-1-one:To a stirred solution ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-7-amine(80 mg, 0.16 mmol, 1 equiv) in DMF (2 mL), was added dimethylglycine (21mg, 0.2 mmol, 1 equiv), ET₃N (0.02 mL, 0.2 mmol, 1.2 equiv), HOBt (27mg, 0.2 mmol, 1.2 equiv) and EDC.HCl (38 mg, 0.2 mmol, 1.2 equiv). Allowto stir the mixture for overnight at RT. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (10 mL) and extracted with ethylacetate (30 mL×2). Organic layer was washed with water (50 mL), brinesolution (50 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude compound, whichwas purified by reverse phase HPLC to obtain2-(dimethylamino)-1-(7-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinolin-2(1H)-yl)ethan-1-one(15 mg, 17%) as a yellow color solid compound. LCMS: 523 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 9.64 (d, J=2.9 Hz, 1H), 8.56 (d, J=4.0 Hz, 1H),7.62-7.53 (m, 2H),7.41 (s, 1H), 7.20-7.04 (m, 2H), 4.62 (d, J=59.5 Hz,2H), 4.30 (t, J=4.3 Hz, 2H), 4.14 (p, J=7.0 Hz,1H), 3.70 (dt, J=34.7,5.8 Hz, 2H), 3.30 (d, J=4.8 Hz, 2H), 3.15 (s, 2H), 2.78 (dt, J=39.7, 5.5Hz, 2H), 2.20 (s, 6H), 1.19 (d, J=6.5 Hz, 6H).

Example-64 Synthesis of2-(dimethylamino)-1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinolin-2(1H)-yl)ethan-1-one.(Compound 456)

To a stirred solution ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-1,2,3,4-tetrahydroisoquinolin-6-amine(80 mg, 0.16 mmol, 1 equiv) in DMF (2 mL), was added dimethylglycine (21mg, 0.2 mmol, 1 equiv), ET₃N (0.02 mL, 0.2 mmol, 1.2 equiv), HOBt (27mg, 0.2 mmol, 1.2 equiv) and EDC.HCl (38 mg, 0.2 mmol, 1.2 equiv). Allowto stir the mixture for overnight at RT. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (10 mL) and extracted with ethylacetate (30 mL×2). Organic layer was washed with water (50 mL), brinesolution (50 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude compound, whichwas purified by reverse phase HPLC to obtain2-(dimethylamino)-1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinolin-2(1H)-yl)ethan-1-one(20 mg, 23%) as a yellow color solid compound. LCMS: 523 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 9.63 (s, 1H), 8.56 (d, J=3.9 Hz, 1H), 7.64-7.46 (m,2H), 7.40 (s,1H), 7.21-7.12 (m, 1H), 7.07 (d, J=8.2 Hz, 1H), 4.65 (d,J=64.5 Hz, 2H), 4.30 (t, J=4.3 Hz, 2H),4.12 (dt, J=11.3, 6.3 Hz, 1H),3.70 (dt, J=32.6, 5.8 Hz, 2H), 3.30 (d, J=4.8 Hz, 2H), 3.16 (s, 2H),2.75 (dt, J=39.4, 5.5 Hz, 2H), 2.19 (d, J=6.3 Hz, 6H), 1.19 (d, J=6.5Hz, 6H).

Example-65 Synthesis of(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)(morpholino)methanone.(Compound 457)

Step-1: Synthesis of (4-amino-2-fluorophenyl) (morpholino) methanone: Toa stirred solution of 4-amino-2-fluorobenzoic acid (1000 mg, 6.45 mmol,1 equiv) in DMF (5 mL), was added morpholine (0.8 mL, 9.67 mmol, 1.5equiv), DIPEA (4.5 mL, 25.8 mmol, 4 equiv) and HATU (4408 mg, 11.6 mmol,1.8 equiv). The reaction mixture was allowed to stir for 3 h at RT.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the reaction mixture was diluted with water (50 mL) andextracted with ethyl acetate (100 mL×3). Organic layer was washed withwater (100 mL), brine solution (100 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain (4-amino-2-fluorophenyl)(morpholino)methanone (1200 mg, 83%) as abrown color viscous compound. LCMS: 225 [M+H]⁺

Step-2: Synthesis of(2-fluoro-4-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)(morpholino)methanone:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added(4-amino-2-fluorophenyl)(morpholino)methanone (74 mg, 0.33 mmol, 1.1equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv). The reactionmixture was degassed with nitrogen gas for 30 min, followed by theaddition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP(8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phaseCombi flash to obtain(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)(morpholino)methanone(50 mg, 32%) as a yellow color solid compound. LCMS: 514 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 10.18 (s, 1H), 8.65 (d, J=3.8 Hz, 1H), 7.96 (dd,J=13.2, 2.0 Hz,1H), 7.49 (dd, J=8.3, 2.0 Hz, 1H), 7.43 (s, 1H), 7.32 (t,J=8.2 Hz, 1H), 7.17 (d, J=11.5 Hz, 1H), 4.30(t, J=4.3 Hz, 2H), 4.16 (h,J=6.6 Hz, 1H), 3.58-3.52 (m, 8H), 3.29 (d, J=7.8 Hz, 2H), 1.18 (d, J=6.5Hz, 6H).

Example-66 Synthesis of(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)(4-hydroxypiperidin-1-yl)methanone.(Compound 458)

Step-1: Synthesis of (4-amino-2-fluorophenyl) (4-hydroxypiperidin-1-yl)methanone: To a stirred solution of 4-amino-2-fluorobenzoic acid (1000mg, 6.45 mmol, 1 equiv) in DMF (5 mL), was added piperidin-4-ol (967 mg,9.67 mmol, 1.5 equiv), DIPEA (4.5 mL, 25.8 mmol, 4 equiv) and HATU (4408mg, 11.6 mmol, 1.8 equiv). The reaction mixture was allowed to stir for3 h at RT. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the reaction mixture was diluted with water(50 mL) and extracted with ethyl acetate (100 mL×3). Organic layer waswashed with water (100 mL), brine solution (100 mL). Organic layer wasdried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain (4-amino-2-fluorophenyl) (4-hydroxypiperidin-1-yl)methanone (1200 mg, 78%) as a brown color viscous compound. LCMS: 239[M+H]⁺

Step-2: Synthesis of(2-fluoro-4-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)(4-hydroxypiperidin-1-yl)methanone:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added(4-amino-2-fluorophenyl)(4-hydroxypiperidin-1-yl)methanone (79 mg, 0.33mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phaseCombi flash to obtain(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)(4-hydroxypiperidin-1-yl)methanone(40 mg, 25%) as a pale yellow color solid compound LCMS: 528 [M+H]⁺;¹HNMR (400 MHz, DMSO-d6) δ 10.15 (s, 1H), 8.65 (d, J=3.9 Hz, 1H), 7.94(dd, J=13.1,2.0 Hz,1H), 7.51-7.41 (m, 2H), 7.28 (t, J=8.2 Hz, 1H), 7.17(d, J=11.6 Hz, 1H), 4.30 (t, J=4.3 Hz, 2H), 4.16(h, J=6.6 Hz, 1H), 4.03(d, J=12.9 Hz, 1H), 3.73 (dp, J=8.6, 4.2, 3.7 Hz, 2H), 3.32 (t, J=4.3Hz, 2H),3.21 (t, J=11.3 Hz, 1H), 3.09 (t, J=11.6 Hz, 1H), 1.77 (s, 1H),1.68 (d, J=7.3 Hz, 1H), 1.35 (dt, J=24.5, 10.6 Hz, 2H), 1.18 (d, J=6.5Hz, 6H).

Example-67 Synthesis of(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)(morpholino)methanone.(Compound 459)

Step-1: Synthesis of (6-aminopyridin-3-yl) (morpholino) methanone: To astirred solution of 6-aminonicotinic acid (1000 mg, 7.24 mmol, 1 equiv)in DMF (5 mL), was added morpholine (0.8 mL, 9.65 mmol, 1.5 equiv),DIPEA (5 mL, 29 mmol, 4 equiv) and HATU (4940 mg, 13 mmol, 1.8 equiv).The reaction mixture was allowed to stir for 3 h at RT. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, the reaction mixture was diluted with water (50 mL) andextracted with ethyl acetate (100 mL×3). Organic layer was washed withwater (100 mL), brine solution (100 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain (6-aminopyridin-3-yl) (morpholino) methanone (1200 mg, 80%) as abrown color viscous compound. LCMS: 208 [M+H]⁺

Step-2: Synthesis of(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)(morpholino)methanone:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added(6-aminopyridin-3-yl)(morpholino)methanone (68 mg, 0.33 mmol, 1.1 equiv)and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv). The reactionmixture was degassed with nitrogen gas for 30 min, followed by theaddition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP(8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phaseCombi flash to obtain(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)(morpholino)methanone(40 mg, 26%) as an off white color solid compound. LCMS: 497 [M+H]⁺;¹HNMR (400 MHz, DMSO-d6) δ 10.34 (s, 1H), 8.67 (d, J=3.9 Hz, 1H), 8.38(s, 1H), 8.28 (d, J=8.7 Hz, 1H), 7.85-7.78 (m, 1H), 7.48 (s, 1H), 7.20(d, J=11.7 Hz, 1H), 4.31 (t, J=4.3 Hz, 2H), 4.17 (p, J=8.2, 7.5 Hz, 1H),3.62 (d, J=4.7 Hz, 4H), 3.54 (s, 4H), 3.30 (d, J=4.8 Hz, 2H) 1.23 (s,6H).

Step-3: Synthesis of(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)(morpholino)methanone:(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)(Morpholino)methanone (10 mg, 0.02 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol(5 mL) and the resultant reaction mixture was allowed to stir at RT for1 h. Solvent was removed under reduced pressure and the residue wasdried under lyophilizer to obtain(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)(morpholino)methanone(HCl salt) (5 mg, 45%) as a yellow color solid compound. LCMS: 497[M+H]⁺; ¹HNMR (400 MHz, DMSO-d6) δ 10.89 (s, 1H), 8.72 (d, J=3.8 Hz,1H), 8.41 (d, J=2.2 Hz, 1H), 8.15 (d, J=8.7 Hz, 1H), 7.95 (dd, J=8.6,2.3 Hz, 1H), 7.46 (s, 1H), 7.25-7.17 (m, 1H), 4.31(t, J=4.2 Hz, 2H),4.17 (p, J=6.4 Hz, 1H), 3.62 (s, 4H), 3.54 (s, 4H), 3.31 (t, J=4.2 Hz,2H), 1.19 (d, J=6.5 Hz, 6H).

Example-68 Synthesis of(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)(4-hydroxypiperidin-1-yl)methanone.(Compound 460)

Step-1: Synthesis of (6-aminopyridin-3-yl) (4-hydroxypiperidin-1-yl)methanone: To a stirred solution of 6-aminonicotinic acid (1000 mg, 7.24mmol, 1 equiv) in DMF (5 mL), was added piperidin-4-ol (975 mg, 9.65mmol, 1.5 equiv), DIPEA (5 mL, 29 mmol, 4 equiv) and HATU (4940 mg, 13mmol, 1.8 equiv). The reaction mixture was allowed to stir for 3 h atRT. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the reaction mixture was diluted with water(50 mL) and extracted with ethyl acetate (100 mL×3). Organic layer waswashed with water (100 mL), brine solution (100 mL). Organic layer wasdried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain(6-aminopyridin-3-yl)(4-hydroxypiperidin-1-yl)methanone (1200 mg, 75%)as a brown color viscous compound. LCMS: 222 [M+H]⁺

Step-2: Synthesis of(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)(4-hydroxypiperidin-1-yl)methanone:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added(6-aminopyridin-3-yl)(4-hydroxypiperidin-1-yl)methanone (73 mg, 0.33mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phaseCombi flash to obtain(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)(4-hydroxypiperidin-1-yl)methanone(50 mg, 32%) as a yellow color solid compound LCMS: 511 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 10.31 (s, 1H),8.64 (d, J=3.8 Hz, 1H), 8.33 (d,J=2.4 Hz, 1H), 8.25 (d, J=8.7 Hz,1H), 7.76 (dd, J=8.4, 2.5 Hz, 1H), 7.46(s, 1H), 7.19 (d, J=11.5 Hz, 1H), 4.80 (d, J=3.9 Hz, 1H), 4.29 (t, J=4.2Hz, 2H), 4.15(p, J=7.1 Hz, 1H), 3.74 (dt, J=9.9, 5.3 Hz, 2H), 3.30 (t,J=4.2 Hz, 2H), 3.21 (td, J=10.2, 9.4, 5.3 Hz,3H), 1.76 (d, J=11.9 Hz,2H), 1.45-1.30 (m, 2H), 1.18 (d, J=6.5 Hz, 6H).

Example-69 Synthesis of N-(4-((4-ethylpiperazin-1-yl)methyl)-3-fluorophenyl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine.(Compound 461)

Step-1: Synthesis of 1-(bromomethyl)-2-fluoro-4-nitrobenzene: To astirred solution of 2-fluoro-1-methyl-4-nitrobenzene (1000 mg, 6.4 mmol,1 equiv) in CCl₄ (15 mL), was added NBS (1139 mg, 6.4 mmol, 1 equiv) andAIBN (210 mg, 1.28 mmol, 0.2 equiv). The resultant reaction mixture wasallowed to stir at 80° C. for overnight. Progress of the reaction wasmonitored by LCMS and TLC. After completion of the reaction, dilutedwith water (50 mL), and extracted with ethyl acetate (150 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to obtain 1-(bromomethyl)-2-fluoro-4-nitrobenzene (400 mg,27%) as an off white solid compound.

Step-2: Synthesis of 1-ethyl-4-(2-fluoro-4-nitrobenzyl) piperazine: To astirred solution of 1-(bromomethyl)-2-fluoro-4-nitrobenzene (300 mg,1.29 mmol, 1 equiv) in ACN (5 mL), was added 1-ethylpiperazine (442 mg,3.87 mmol, 3 equiv). The resultant reaction mixture was allowed to stirat RT for 1 h. Progress of the reaction was monitored by LCMS and NMR.After completion of the reaction, diluted with water (30 mL), andextracted with ethyl acetate (100 mL). Organic layer was washed withwater (50 mL) and brine solution (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain 1-ethyl-4-(2-fluoro-4-nitrobenzyl) piperazine (300 mg, 87%) as ayellow oily compound. LCMS: 268 [M+H]⁺

Step-3: Synthesis of 4-((4-ethylpiperazin-1-yl) methyl)-3-fluoroaniline:To a stirred solution of 1-ethyl-4-(2-fluoro-4-nitrobenzyl)piperazine(300 mg, 1.12 mmol, 1 equiv) in ethanol (5 mL), water (1 mL), was addediron powder (189 mg, 3.37 mmol, 3 equiv) and ammonium chloride (121 mg,2.24 mmol, 2 equiv). The resultant reaction mixture was allowed to stirat 90° for 1 h. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, the mixture was passes through celitebed and the filtrate was concentrated under reduced pressure to obtain4-((4-ethylpiperazin-1-yl) methyl)-3-fluoroaniline (200 mg, 75%) as adark brown solid compound. LCMS: 238 [M+H]⁺

Step-4: Synthesis of N-(4-((4-ethylpiperazin-1-yl)methyl)-3-fluorophenyl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added4-((4-ethylpiperazin-1-yl)methyl)-3-fluoroaniline (78 mg, 0.33 mmol, 1.1equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv). The reactionmixture was degassed with nitrogen gas for 30 min, followed by theaddition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP(8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified byrecrystallization with methanol to obtainN-(4-((4-ethylpiperazin-1-yl)methyl)-3-fluorophenyl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(40 mg, 25%) as a yellow color solid compound. LCMS: 527 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 9.93 (s, 1H), 8.61 (d, J=4.0 Hz, 1H), 7.82-7.73(m,1H), 7.49-7.39 (m, 2H), 7.30-7.13 (m, 2H), 4.30 (t, J=4.2 Hz, 2H),4.16 (h, J=7.9, 7.3 Hz, 1H), 3.45(s, 2H), 3.31 (d, J=4.6 Hz, 2H), 2.38(s, 8H), 2.31 (q, J=6.9 Hz, 2H), 1.18(d, J=6.4 Hz, 6H), 0.97 (t, J=7.1Hz, 3H).

Example-70 Synthesis of N-(4-((4-(dimethyl amino) piperidin-1-yl)methyl)-3-fluorophenyl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine.(Compound 462)

Step-1: Synthesis of 1-(bromomethyl)-2-fluoro-4-nitrobenzene: To astirred solution of 2-fluoro-1-methyl-4-nitrobenzene (1000 mg, 6.4 mmol,1 equiv) in CCl₄ (15 mL), was added NBS (1139 mg, 6.4 mmol, 1 equiv) andAIBN (210 mg, 1.28 mmol, 0.2 equiv). The resultant reaction mixture wasallowed to stir at 80° C. for overnight. Progress of the reaction wasmonitored by LCMS and TLC. After completion of the reaction, dilutedwith water (50 mL), and extracted with ethyl acetate (150 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to obtain 1-(bromomethyl)-2-fluoro-4-nitrobenzene (400 mg,27%) as an off white solid compound.

LCMS: 234 [M+H]⁺

Step-2: Synthesis of1-(2-fluoro-4-nitrobenzyl)-N,N-dimethylpiperidin-4-amine: To a stirredsolution of 1-(bromomethyl)-2-fluoro-4-nitrobenzene (300 mg, 1.29 mmol,1 equiv) in ACN (5 mL), was added N,N-dimethylpiperidin-4-amine (495 mg,3.87 mmol, 3 equiv). The resultant reaction mixture was allowed to stirat RT for 1 h. Progress of the reaction was monitored by LCMS and NMR.After completion of the reaction, diluted with water (30 mL), andextracted with ethyl acetate (100 mL). Organic layer was washed withwater (50 mL) and brine solution (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain 1-(2-fluoro-4-nitrobenzyl)-N,N-dimethylpiperidin-4-amine (300 mg,83%) as a yellow oily compound. LCMS: 282 [M+H]⁺

Step-3: Synthesis of1-(4-amino-2-fluorobenzyl)-N,N-dimethylpiperidin-4-amine: To a stirredsolution of 1-(2-fluoro-4-nitrobenzyl)-N,N-dimethylpiperidin-4-amine(300 mg, 1.06 mmol, 1 equiv) in ethanol (5 mL), water (1 mL), was addediron powder (179 mg, 3.2 mmol, 3 equiv) and ammonium chloride (114 mg,2.12 mmol, 2 equiv). The resultant reaction mixture was allowed to stirat 90° for 1 h. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, the mixture was passes through celitebed and the filtrate was concentrated under reduced pressure to obtain1-(4-amino-2-fluorobenzyl)-N,N-dimethylpiperidin-4-amine (250 mg, 93%)as a dark brown solid compound. LCMS: 252 [M+H]⁺

Step-3: Synthesis of N-(4-((4-(dimethyl amino) piperidin-1-yl)methyl)-3-fluorophenyl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added1-(4-amino-2-fluorobenzyl)-N,N-dimethylpiperidin-4-amine (83 mg, 0.33mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified byrecrystallization with methanol to obtainN-(4-((4-(dimethylamino)piperidin-1-yl)methyl)-3-fluorophenyl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(50 mg, 30%) as a yellow color solid compound. LCMS: 541 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 9.92 (s, 1H), 8.61 (d, J=3.5 Hz, 1H), 8.23 (s, 1H),7.77 (d, J=13.2 Hz, 1H), 7.36-7.50 (m, 2H), 7.25 (s, 1H), 7.17 (d,J=11.8 Hz, 1H), 4.30 (br. s, 2H), 4.17 (br. s, 1H), 3.44 (s, 3H), 3.31(br. s, 2H), 2.84 (d, J=11.0 Hz, 2H), 2.11-2.28 (m, 6H), 1.94 (t, J=11.2Hz, 2H), 1.72 (d, J=11.8 Hz, 2H), 1.38 (d, J=9.2 Hz, 2H), 1.18 ppm (d,J=6.6 Hz, 6H).

Example-71 Synthesis of(4-(dimethylamino)piperidin-1-yl)(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)methanone.(Compound 463)

Step-1: Synthesis of (4-amino-2-fluorophenyl) (4-(dimethylamino)piperidin-1-yl) methanone: To a stirred solution of4-amino-2-fluorobenzoic acid (500 mg, 3.22 mmol, 1 equiv) in DMF (5 mL),was added N,N-dimethylpiperidin-4-amine (619 mg, 4.83 mmol, 1.5 equiv),DIPEA (2.2 mL, 13 mmol, 4 equiv) and HATU (2203 mg, 6 mmol, 1.8 equiv).The reaction mixture was allowed to stir for 3 h at RT. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, the reaction mixture was diluted with water (50 mL) andextracted with ethyl acetate (100 mL×3). Organic layer was washed withwater (100 mL), brine solution (100 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain (4-amino-2-fluorophenyl) (4-(dimethylamino) piperidin-1-yl)methanone (700 mg, 82%) as a brown color viscous compound. LCMS: 266[M+H]⁺

Step-2: Synthesis of(4-(dimethylamino)piperidin-1-yl)(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)methanone:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added(4-amino-2-fluorophenyl)(4-(dimethylamino)piperidin-1-yl)methanone (88mg, 0.33 mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5equiv). The reaction mixture was degassed with nitrogen gas for 30 min,followed by the addition of palladium acetate (2 mg, 0.006 mmol, 0.02equiv) and BINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reactionmixture was allowed to stir at 100° C. for overnight. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, diluted with water (30 mL) and extracted with ethyl acetate(100 mL). Organic layer was washed with water (50 mL) and brine solution(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude, which was purifiedby normal phase Combi flash to obtain(4-(dimethylamino)piperidin-1-yl)(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)methanone(35 mg, 21%) as a yellow color solid compound. LCMS: 555 [M+H]⁺ ¹HNMR(400 MHz, DMSO-d6) δ 10.16 (s, 1H), 8.65 (d, J=3.5 Hz, 1H), 8.18 (s,1H), 7.95 (d, J=13.2 Hz, 1H), 7.37-7.55 (m, 2H), 7.30 (d, J=8.3 Hz, 1H),7.17 (d, J=11.8 Hz, 1H), 4.44 (br. s, 1H), 4.30 (br. s, 2H), 4.06-4.20(m, 1H), 3.50 (br. s, 2H), 3.31 (br. s, 2H), 3.03 (br. s, 1H), 2.79 (d,J=11.4 Hz, 1H), 2.20 (s, 6H), 1.83 (br. s, 1H), 1.73 (d, J=11.4 Hz, 1H),1.31 (br. s, 2H), 1.18 ppm (d, J=6.6 Hz, 6H).

Example-72 Synthesis of(4-ethylpiperazin-1-yl)(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)methanone.(Compound 464)

Step-1: Synthesis of (4-amino-2-fluorophenyl) (4-ethylpiperazin-1-yl)methanone: To a stirred solution of 4-amino-2-fluorobenzoic acid (500mg, 3.22 mmol, 1 equiv) in DMF (5 mL), was added 1-ethylpiperazine (551mg, 4.83 mmol, 1.5 equiv), DIPEA (2.2 mL, 13 mmol, 4 equiv) and HATU(2203 mg, 6 mmol, 1.8 equiv). The reaction mixture was allowed to stirfor 3 h at RT. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, the reaction mixture was diluted withwater (50 mL) and extracted with ethyl acetate (100 mL×3). Organic layerwas washed with water (100 mL), brine solution (100 mL). Organic layerwas dried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain (4-amino-2-fluorophenyl) (4-ethylpiperazin-1-yl)methanone (700 mg, 86%) as a brown color viscous compound. LCMS: 252[M+H]⁺

Step-2: Synthesis of(4-ethylpiperazin-1-yl)(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)methanone:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added(4-amino-2-fluorophenyl)(4-ethylpiperazin-1-yl)methanone (83 mg, 0.33mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phaseCombi flash to obtain(4-ethylpiperazin-1-yl)(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)methanone(50 mg, 30%) as a yellow color solid compound LCMS: 541 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 10.17 (s, 1H), 8.65 (d, J=3.9 Hz, 1H), 7.95 (d,J=12.7 Hz, 1H), 7.38-7.52 (m, 2H), 7.29 (t, J=8.3 Hz, 1H), 7.17 (d,J=11.4 Hz, 1H), 4.30 (br. s, 2H), 4.04-4.20 (m, 1H), 3.62 (br. s, 2H),3.31 (br. s, 4H), 2.15-2.43 (m, 6H), 1.18 (d, J=6.6 Hz,6H), 1.00 ppm (t,J=7.2 Hz, 3H).

Example-73 Synthesis of4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)thiomorpholine1,1-dioxide. (Compound 465)

Step-1: Synthesis 4-(2-fluoro-4-nitrophenyl) thiomorpholine: To astirred solution of 1,2-difluoro-4-nitrobenzene (500 mg, 3.14 mmol, 1equiv) in ACN (10 mL), was added DIPEA (0.8 mL, 4.71mmol, 1.5 equiv) andthiomorpholine (388 mg, 3.76 mmol, 1.2 equiv). The resultant reactionmixture was allowed to stir at 80° for overnight. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, the mixture was diluted with ice water (50 mL) and extractedwith ethyl acetate (100 mL). Organic layer was washed with water (50 mL)and brine solution (50 mL). Organic layer was dried over anhydroussodium sulphate and concentrated under reduced pressure to obtain toobtain 4-(2-fluoro-4-nitrophenyl) thiomorpholine (700 mg, 92%) as abrown oily compound. LCMS: 243[M+H]⁺

Step-2: Synthesis 4-(2-fluoro-4-nitrophenyl) thiomorpholine 1,1-dioxide: To a stirred solution of 4-(2-fluoro-4-nitrophenyl)thiomorpholine (500 mg, 2.06 mmol, 1 equiv) in methanol; water (1:1=10mL), was added oxone (1586 mg, 5.16 mmol, 2.5 equiv). The resultantreaction mixture was allowed to stir at RT for overnight. Progress ofthe reaction was monitored by TLC and LCMS. After completion of thereaction, solvent was completely removed under reduced pressure and theresidue mixture was diluted with ice water (50 mL) and extracted withethyl acetate (100 mL). Organic layer was washed with water (50 mL) andbrine solution (50 mL). Organic layer was dried over anhydrous sodiumsulphate and concentrated under reduced pressure to obtain to obtain4-(2-fluoro-4-nitrophenyl) thiomorpholine 1, 1-dioxide (400 mg, 71%) asa yellow solid compound. LCMS: 251 [M+H]⁺

Step-3: Synthesis of 4-(4-amino-2-fluorophenyl) thiomorpholine 1,1-dioxide: To a stirred solution of 4-(2-fluoro-4-nitrophenyl)thiomorpholine 1, 1-dioxide (200 mg, 0.72 mmol, 1 equiv) in ethanol (6mL), water (2 mL), was added iron powder (123 mg, 2.1 mmol, 3 equiv) andammonium chloride (78 mg, 1.44 mmol, 2 equiv). The resultant reactionmixture was allowed to stir at 90° for 1 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, the mixturewas passes through celite bed and the filtrate was concentrated underreduced pressure to obtain 4-(4-amino-2-fluorophenyl) thiomorpholine1,1-dioxide (150 mg, 84%) as an off white solid compound. LCMS: 245[M+H]⁺

Step-4: Synthesis of4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)thiomorpholine1,1-dioxide: To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added4-(4-amino-2-fluorophenyl)thiomorpholine 1,1-dioxide (81 mg, 0.33 mmol,1.1 equiv) and cesium carbonate (147 mg, 0.45 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtain4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)thiomorpholine1,1-dioxide (45 mg, 27%) as a yellow color solid compound. LCMS: 534[M+H]³⁰ ; ¹HNMR (400 MHz, DMSO-d6) δ 9.82 (s, 1H), 8.58 (d, J=3.5 Hz,1H), 7.81 (dd, J=15.1,2.4 Hz, 1H), 7.28-7.47 (m, 2H), 6.99-7.21 (m, 2H),4.30 (d, J=4.4 Hz, 2H), 4.15 (d, J=6.6 Hz, 1H), 3.37-3.52 (m, 4H), 3.26(br. s, 6H), 1.06-1.26 ppm (m, 6H).

Example-74 Synthesis of 5-fluoro-N-(3-fluoro-4-(1-methylpiperidin-4-yl)phenyl)-4-(8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine.(Compound 466)

Step-1: Synthesis of tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.33 mmol, 1 equiv) in Dioxane (10 mL), was added tert-butyl4-(4-amino-2-fluorophenyl)piperidine-1-carboxylate (109 mg, 0.37 mmol,1.1 equiv) and cesium carbonate (161 mg, 0.49 mmol, 1.5 equiv). Thereaction mixture was purged with nitrogen gas for 30 min, followed bythe addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.013 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brine(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound, which waspurified by normal phase combi flash to obtain tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperidine-1-carboxylate(150 mg, 80%) as a yellow solid compound. LCMS: 556 [M+H]⁺

Step-2: Synthesis of 5-fluoro-N-(3-fluoro-4-(piperidin-4-yl)phenyl)-4-(8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperidine-1-carboxylate(150 mg, 0.27 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure and the residuewas dried under lyophilizer to obtain5-fluoro-N-(3-fluoro-4-(piperidin-4-yl)phenyl)-4-(8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(100 mg, 75%) as a brick red color solid compound. LCMS: 456 [M+H]⁺

Step-3: Synthesis of 5-fluoro-N-(3-fluoro-4-(1-methylpiperidin-4-yl)phenyl)-4-(8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a stirred solution of5-fluoro-N-(3-fluoro-4-(piperidin-4-yl)phenyl)-4-(8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(100 mg, 0.2 mmol, 1 equiv) in DCE (5 mL), was added Formaldehyde (40%in water) (0.02 mL, 0.61 mmol, 3 equiv), acetic acid (0.05 mL, 1.0 mmol,5 equiv). The reaction mixture was allowed to stir at RT for 1 h. Thereaction mixture was cooled to 0° C. NaCNBH₃ (38 mg, 0.61 mmol, 3 equiv)was added to above mixture and raise the temperature to RT. The reactionmixture was allowed to stir at RT for 1 h. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, the reactionmixture was diluted with water (25 mL) and extracted with ethyl acetate(50 mL×2). Organic layer was washed with water (50 mL) and brinesolution (50 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by reverse phase HPLC to afford5-fluoro-N-(3-fluoro-4-(1-methylpiperidin-4-yl)phenyl)-4-(8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(40 mg, 42%) as a yellow color solid compound. LCMS: 470 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 9.90 (s, 1H), 8.60 (d, J=3.9 Hz, 1H), 8.16 (s, 1H),7.83 (d, J=13.6 Hz, 1H), 7.39 (d, J=6.6 Hz, 1H), 7.32 (s, 1H), 7.15-7.28(m, 2H), 4.28-4.43 (m, 2H), 3.30-3.44 (m, 2H), 3.11 (d, J=11.4 Hz, 2H),2.96 (s, 3H), 2.80 (br. s, 1H), 2.43 (s, 5H), 1.78 ppm (br. s, 4H).

Example-75 Synthesis of N-(4-(4-(dimethylamino)piperidin-1-yl)-3-fluorophenyl)-5-fluoro-4-(8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine.(Compound 467)

Step-1: Synthesis of N-(4-(4-(dimethylamino)piperidin-1-yl)-3-fluorophenyl)-5-fluoro-4-(8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.33 mmol, 1 equiv) in Dioxane (10 mL), was added1-(4-amino-2-fluorophenyl)-N,N-dimethylpiperidin-4-amine (88 mg, 0.37mmol, 1.1 equiv) and cesium carbonate (161 mg, 0.49 mmol, 1.5 equiv).The reaction mixture was purged with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.013 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brine(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound, which waspurified by reverse phase HPLC to obtainN-(4-(4-(dimethylamino)piperidin-1-yl)-3-fluorophenyl)-5-fluoro-4-(8-fluoro-4-methyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(30 mg, 18%) as a yellow color solid compound. LCMS: 499 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 9.73 (s, 1H), 8.57 (d, J=3.9 Hz, 1H), 8.23 (br. s,1H), 7.79 (d, J=14.5 Hz, 1H), 7.30-7.38 (m, 2H), 7.22 (d, J=11.8 Hz,1H), 6.99 (t, J=9.4 Hz, 1H), 4.38 (br. s, 2H), 3.37 (br. s, 2H), 3.30(d, J=11.0 Hz, 2H), 2.96 (s, 3H), 2.54-2.69 (m, 3H), 2.24 (s, 6H), 1.85(d, J=10.5 Hz, 2H), 1.55 ppm (d, J=9.2 Hz, 2H)

Example-76 Synthesis of N-(4-(4-(dimethylamino)piperidin-1-yl)-3-fluorophenyl)-5-fluoro-4-(8-fluoro-4-propyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine.(Compound 468)

To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-propyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.32 mmol, 1 equiv) in Dioxane (10 mL), was added1-(4-amino-2-fluorophenyl)-N,N-dimethylpiperidin-4-amine (78 mg, 0.33mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv).The reaction mixture was purged with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.013 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brine(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound, which waspurified by reverse phase HPLC to obtainN-(4-(4-(dimethylamino)piperidin-1-yl)-3-fluorophenyl)-5-fluoro-4-(8-fluoro-4-propyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(30 mg, 19%) as a yellow color solid compound. LCMS: 527 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 9.72 (s, 1H), 8.56 (d, J=3.5 Hz, 1H), 8.26 (br. s,1H), 7.71 (d, J=15.3 Hz, 1H), 7.38 (d, J=8.3 Hz, 1H), 7.28 (br. s, 1H),7.14 (d, J=11.4 Hz, 1H), 6.98 (t, J=9.4 Hz, 1H), 4.30 (br. s, 2H), 3.43(br. s, 2H), 3.31 (br. s, 4H), 2.56-2.71 (m, 3H), 2.23 (s, 6H), 1.84 (d,J=11.4 Hz, 2H), 1.42-1.70 (m, 4H), 0.89 ppm (t, J=7.2 Hz, 3H).

Example-77 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(3-fluoro-4-thiomorpholinophenyl)pyrimidin-2-amine.(Compound 469)

Step-1: Synthesis 4-(2-fluoro-4-nitrophenyl) thiomorpholine: To astirred solution of 1,2-difluoro-4-nitrobenzene (500 mg, 3.14 mmol, 1equiv) in ACN (10 mL), was added DIPEA (0.8 mL, 4.71mmol, 1.5 equiv) andthiomorpholine (388 mg, 3.76 mmol, 1.2 equiv). The resultant reactionmixture was allowed to stir at 80° for overnight. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, the mixture was diluted with ice water (50 mL) and extractedwith ethyl acetate (100 mL). Organic layer was washed with water (50 mL)and brine solution (50 mL). Organic layer was dried over anhydroussodium sulphate and concentrated under reduced pressure to obtain toobtain 4-(2-fluoro-4-nitrophenyl) thiomorpholine (700 mg, 92%) as abrown oily compound. LCMS: 243[M+H]⁺

Step-2: Synthesis of 3-fluoro-4-thiomorpholinoaniline: To a stirredsolution of 4-(2-fluoro-4-nitrophenyl)thiomorpholine (300 mg, 1.23 mmol,1 equiv) in ethanol (6 mL), water (2 mL), was added iron powder (208 mg,3.7 mmol, 3 equiv) and ammonium chloride (133 mg, 2.45 mmol, 2 equiv).The resultant reaction mixture was allowed to stir at 90° for 1 h.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the mixture was passes through celite bed and thefiltrate was concentrated under reduced pressure to obtain3-fluoro-4-thiomorpholinoaniline (200 mg, 76%) as a yellow color solidcompound. LCMS: 213 [M+H]⁺

Step-3: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(3-fluoro-4-thiomorpholinophenyl)pyrimidin-2-amine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added3-fluoro-4-thiomorpholinoaniline (70 mg, 0.33 mmol, 1.1 equiv) andcesium carbonate (147 mg, 0.45 mmol, 1.5 equiv). The reaction mixturewas degassed with nitrogen gas for 30 min, followed by the addition ofpalladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP (8 mg, 0.012mmol, 0.04 equiv). The resultant reaction mixture was allowed to stir at100° C. for overnight. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, diluted with water (30 mL) andextracted with ethyl acetate (100 mL). Organic layer was washed withwater (50 mL) and brine solution (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by reverse phase HPLC to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(3-fluoro-4-thiomorpholinophenyl)pyrimidin-2-amine(10 mg, 6%) as a yellow color solid compound. LCMS: 502 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 9.69 (br. s, 1H), 8.52 (d, J=3.9 Hz, 1H), 7.70 (s,1H), 7.74 (s, 1H), 7.41 (br. s, 1H), 7.34 (d, J=8.3 Hz, 1H), 7.14 (d,J=11.8 Hz, 1H), 7.00 (t, J=9.2 Hz, 2H), 4.28 (br. s, 2H), 4.06-4.17 (m,1H), 3.29 (br. s, 2H), 3.09-3.20 (m, 4H), 2.73 (br. s, 4H), 1.16 ppm (d,J=6.6 Hz, 6H).

Example-78 Synthesis of4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-(4-(dimethylamino)piperidin-1-yl)-3-fluorophenyl)-5-fluoropyrimidin-2-amine.(Compound 470)

Step-1: Synthesis of 4-bromo-2-(cyclopentylamino)-6-fluorophenol: To astirred solution of 2-amino-4-bromo-6-fluorophenol (3000 mg, 14.63 mmol,1 equiv) in DCE (30 mL), was added cyclopentanone (3687 mg, 43.89 mmol,3 equiv), acetic acid (4.2 mL, 1.0 mmol, 73.15 equiv). The reactionmixture was allowed to stir at RT for 1 h. The reaction mixture wascooled to 0° C. NaBH (OAC)₃ (9305 mg, 43.89 mmol, 3 equiv) was added toabove mixture and raise the temperature to RT. The reaction mixture wasallowed to stir at RT for 1 h. Progress of the reaction was monitored byLCMS. After completion of the reaction, the reaction mixture was dilutedwith water (100 mL) and extracted with ethyl acetate (150 mL×3). Organiclayer was washed with water (150 mL) and brine solution (150 mL).Organic layer was dried over anhydrous sodium sulphate and concentratedunder reduced pressure to obtain crude, which was purified by normalphase combi flash to afford 4-bromo-2-(cyclopentylamino)-6-fluorophenol(3600 mg, 90%) as a dark brown viscous compound. LCMS: 274 [M+H]⁺

Step-2: Synthesis of6-bromo-4-cyclopentyl-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one: To astirred solution of 4-bromo-2-(cyclopentylamino)-6-fluorophenol (3000mg, 10.9 mmol, 1 equiv) in chloroform (30 mL), was added NaHCO₃ (4578mg, 54.5 mmol, 5 equiv) and Benzyltriethyl ammonium chloride (2485 mg,10.9 mmol, 1 equiv). The reaction mixture was allowed to stir at RT for1 h. The reaction mixture was cooled to 0° C, followed by the additionof chloroacetyl chloride (0.9 mL, 10.9 mmol, 1 equiv). The reactionmixture was allowed to stir at 0° C. for 1 h. Raise the temp. to 70° C.and reaction mixture was allowed to stir for overnight. Progress of thereaction was monitored by LCMS. After completion of the reaction, thereaction mixture was diluted with water (100 mL) and extracted withethyl acetate (150 mL×3). Organic layer was washed with water (150 mL)and brine solution (150 mL). Organic layer was dried over anhydroussodium sulphate and concentrated under reduced pressure to obtain crude,which was purified by column chromatography to afford6-bromo-4-cyclopentyl-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one (1000mg, 29%) as a brown color solid compound. LCMS: 314 [M+H]⁺

Step-3: Synthesis of6-bromo-4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine: To astirred solution of6-bromo-4-cyclopentyl-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one (1000mg, 3.19 mmol, 1 equiv) in THF (15 mL), was added BH₃.DMS (2 M in THF)(6.3 mL, 12.7 mmol, 4 equiv) at 0° C. drop wise. The reaction mixturewas allowed to stir at 50° C. for overnight. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was quenched with saturated solution of NaHCO₃ (50 mL)and extracted with ethyl acetate (100 mL×2). Organic layer was washedwith water (100 mL), dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain6-bromo-4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine (900mg, 94%) as a transparent oil compound. LCMS: 300 [M+H]⁺

Step-4: Synthesis of4-cyclopentyl-8-fluoro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine:6-bromo-4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine (900mg, 3.01 mmol, 1 equiv),4,4,5,5-tetramethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,2-dioxaborolane(1147 mg, 4.51 mmol, 1.5 equiv), Potassium acetate (735 mg, 7.5 mmol,2.5 equiv) and dioxane (10 mL) were charged in a 25 mL glass bottle.Purged the reaction mixture with nitrogen gas for 15 min, Pd(dppf)Cl2.DCM (123 mg, 0.15 mmol, 0.05 equiv) was added to above mixture and thereaction mixture was allowed to stir at 100° C. for 3 h. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, the reaction mixture was diluted with water (30 mL) andextracted with ethyl acetate (100 mL×2). Organic layer was washed withbrine (100 mL) and water (100 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain4-cyclopentyl-8-fluoro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(1000 mg, 96%) as a dark brown viscous compound. LCMS: 348 [M+H]⁺

Step-5: Synthesis of6-(2-chloro-5-fluoropyrimidin-4-yl)-4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine:To a stirred solution of 2,4-dichloro-5-fluoropyrimidine (450 mg, 2.7mmol, 1 equiv) in THF: Water (1:1=10 mL) was added4-cyclopentyl-8-fluoro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(941 mg, 2.7 mmol, 1 equiv), Potassium carbonate (745 mg, 5.4 mmol, 2equiv) and Pd(PPh₃)₄ (156 mg, 0.13 mmol, 0.05 equiv). The reactionmixture was allowed to stir at 80° C. for 3 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (50 mL) and extracted with ethylacetate (150 mL). Organic layer was washed with water (50 mL) and brine(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound, which waspurified by normal phase combi-flash to obtain6-(2-chloro-5-fluoropyrimidin-4-yl)-4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine(300 mg, 32%) as a yellow solid compound. LCMS: 352 [M+H]⁺

Step-6: Synthesis of4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-(4-(dimethylamino)piperidin-1-yl)-3-fluorophenyl)-5-fluoropyrimidin-2-amine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.28 mmol, 1 equiv) in Dioxane (10 mL), was added1-(4-amino-2-fluorophenyl)-N,N-dimethylpiperidin-4-amine (74 mg, 0.31mmol, 1.1 equiv) and cesium carbonate (137 mg, 0.42 mmol, 1.5 equiv).The reaction mixture was purged with nitrogen gas for 30 min, followedby the addition of palladium acetate (1.3 mg, 0.005 mmol, 0.02 equiv)and BINAP (7 mg, 0.01 mmol, 0.04 equiv). The resultant reaction mixturewas allowed to stir at 100° C. for overnight. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brine(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound, which waspurified by reverse phase HPLC to obtain4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-(4-(dimethylamino)piperidin-1-yl)-3-fluorophenyl)-5-fluoropyrimidin-2-amine(20 mg, 13%) as a brick red color solid compound. LCMS: 553 [M+H]⁺;¹HNMR (400 MHz, DMSO-d6) δ 9.76 (s, 1H), 8.57 (s, 1H), 7.73 (dd,J=15.1,2.4 Hz, 1H), 7.34-7.48 (m, 2H), 7.16 (d, J=11.8 Hz, 1H), 7.02 (d,J=9.6 Hz, 1H), 4.31 (br. s, 2H), 4.27 (br. s, 1H), 3.34-3.48 (m, 4H),3.33 (br. s, 1H), 2.78 (d, J=4.8 Hz, 6H), 2.53-2.69 (m, 2H), 2.09 (d,J=11.0 Hz, 2H), 1.89 (d, J=8.3 Hz, 2 H), 1.78 (d, J=8.3 Hz, 2H),1.45-1.74 ppm (m, 6H).

Example-79 Synthesis of4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoro-N-(3-fluoro-4-(1-methylpiperidin-4-yl)phenyl)pyrimidin-2-amine.(Compound 471)

Step-1: Synthesis of tert-butyl4-(4-((4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)-2-fluorophenyl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine(200 mg, 0.56 mmol, 1 equiv) in Dioxane (10 mL), was added tert-butyl4-(4-amino-2-fluorophenyl)piperidine-1-carboxylate (184 mg, 0.62 mmol,1.1 equiv) and cesium carbonate (274 mg, 0.84 mmol, 1.5 equiv). Thereaction mixture was purged with nitrogen gas for 30 min, followed bythe addition of palladium acetate (3 mg, 0.011 mmol, 0.02 equiv) andBINAP (14 mg, 0.022 mmol, 0.04 equiv). The resultant reaction mixturewas allowed to stir at 100° C. for overnight. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brine(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound, which waspurified column chromatography to obtain tert-butyl4-(4-((4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)-2-fluorophenyl)piperidine-1-carboxylate(170 mg, 49%) as a yellow solid compound. LCMS: 610 [M+H]⁺

Step-2: Synthesis of4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoro-N-(3-fluoro-4-(piperidin-4-yl)phenyl)pyrimidin-2-amine:tert-butyl4-(4-((4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)-2-fluorophenyl)piperidine-1-carboxylate(170 mg, 0.27 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure and the residuewas dried under lyophilizer to obtain4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoro-N-(3-fluoro-4-(piperidin-4-yl)phenyl)pyrimidin-2-amine(130 mg, 86%) as a brick red color solid compound. LCMS: 510 [M+H]⁺

Step-3: Synthesis of4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoro-N-(3-fluoro-4-(1-methylpiperidin-4-yl)phenyl)pyrimidin-2-amine:To a stirred solution of4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoro-N-(3-fluoro-4-(piperidin-4-yl)phenyl)pyrimidin-2-amine(70 mg, 0.12 mmol, 1 equiv) in DCE (5 mL), was added Formaldehyde (40%in water) (0.01 mL, 0.38 mmol, 3 equiv), acetic acid (0.03 mL, 0.6 mmol,5 equiv). The reaction mixture was allowed to stir at RT for 1 h. Thereaction mixture was cooled to 0° C. NaCNBH₃ (23 mg, 0.38 mmol, 3 equiv)was added to above mixture and raise the temperature to RT. The reactionmixture was allowed to stir at RT for 1 h. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, the reactionmixture was diluted with water (25 mL) and extracted with ethyl acetate(50 mL×2). Organic layer was washed with water (50 mL) and brinesolution (50 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by reverse phase HPLC to afford4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoro-N-(3-fluoro-4-(1-methylpiperidin-4-yl)phenyl)pyrimidin-2-amine(7 mg, 10%) as a light orange color solid compound. LCMS: 524 [M+H]⁺;¹HNMR (400 MHz, DMSO-d6) δ 9.94 (s, 1H), 8.61 (d, J=3.9 Hz, 1H), 7.82(s, 1H), 7.36-7.54 (m, 2H), 7.18 (d, J=8.8 Hz, 2H), 4.32 (br. s, 3H),3.51 (d, J=13.2 Hz, 2H), 3.34 (br. s, 2H), 3.12 (d, J=11.0 Hz, 2H), 3.00(br. s, 1H), 2.81 (s, J=4.8 Hz, 3H), 1.80-2.04 (m, 6H), 1.69-1.60 ppm(m, 6H).

Example-80 Synthesis of1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-4-methylpiperazin-2-one.(Compound 472)

Step-1: Synthesis tert-butyl4-(6-nitropyridin-3-yl)-3-oxopiperazine-1-carboxylate: To a solution of5-bromo-2-nitropyridine (1000 mg, 4.95 mmol, 1 equiv) in Dioxane (10mL), was added tert-butyl 3-oxopiperazine-1-carboxylate (990 mg, 4.95mmol, lequiv) and cesium carbonate (4034 mg, 12.3 mmol, 2.5 equiv). Thereaction mixture was purged with nitrogen gas for 30 min, followed bythe addition of Pd2(dba)3 (227 mg, 0.24 mmol, 0.05 equiv) and Xantphos(230 mg, 0.39 mmol, 0.08 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (50 mL) and extracted with ethylacetate (150 mL×2). Organic layer was washed with water (100 mL) andbrine (100 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude compound, whichwas purified by normal phase combi flash to obtain tert-butyl4-(6-nitropyridin-3-yl)-3-oxopiperazine-1-carboxylate (500 mg, 37%) as ayellow solid compound. LCMS: 323 [M+H]⁺

Step-2: Synthesis of tert-butyl4-(6-aminopyridin-3-yl)-3-oxopiperazine-1-carboxylate: To a stirredsolution of tert-butyl4-(6-nitropyridin-3-yl)-3-oxopiperazine-1-carboxylate (500 mg, 1.55mmol, 1 equiv) in ethanol (8 mL), water (2 mL), was added iron powder(261 mg, 4.65 mmol, 3 equiv) and ammonium chloride (167 mg, 3.1 mmol, 2equiv). The resultant reaction mixture was allowed to stir at 90° for 1h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the mixture was passes through celite bedand the filtrate was concentrated under reduced pressure to obtaintert-butyl 4-(6-aminopyridin-3-yl)-3-oxopiperazine-1-carboxylate (300mg, 77%) as a brown color solid compound. LCMS: 293 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-3-oxopiperazine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.33 mmol, 1 equiv) in Dioxane (10 mL), was added tert-butyl4-(6-aminopyridin-3-yl)-3-oxopiperazine-1-carboxylate (96 mg, 0.37 mmol,1.1 equiv) and cesium carbonate (161 mg, 0.49 mmol, 1.5 equiv). Thereaction mixture was purged with nitrogen gas for 30 min, followed bythe addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.013 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brine(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound, which waspurified by normal phase combi flash to obtain tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-3-oxopiperazine-1-carboxylate(140 mg, 79%) as a yellow solid compound. LCMS: 582 [M+H]⁺

Step-4: Synthesis of1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazin-2-onehydrochloride: tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-3-oxopiperazine-1-carboxylate(140 mg, 0.24 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure and the residuewas dried under lyophilizer to obtain1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazin-2-onehydrochloride (120 mg, 96%) as a brick red color solid compound. LCMS:482 [M+H]⁺

Step-5: Synthesis of1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-4-methylpiperazin-2-one:To a stirred solution of1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazin-2-one(60 mg, 0.11 mmol, 1 equiv) in DCE (3 mL), was added Formaldehyde (40%in water) (0.01 mL, 0.33 mmol, 3 equiv), acetic acid (0.03 mL, 0.55mmol, 5 equiv). The reaction mixture was allowed to stir at RT for 1 h.The reaction mixture was cooled to 0° C. NaCNBH₃ (21 mg, 0.33 mmol, 3equiv) was added to above mixture and raise the temperature to RT. Thereaction mixture was allowed to stir at RT for 1 h. Progress of thereaction was monitored by LCMS. After completion of the reaction, thereaction mixture was diluted with water (15 mL) and extracted with DCM(50 mL×2). Organic layer was washed with water (50 mL) and brinesolution (50 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by reverse phase HPLC to afford1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-4-methylpiperazin-2-one(5 mg, 9%) as a yellow color solid compound. LCMS: 496 [M+H]³⁰ ; ¹HNMR(400 MHz, DMSO-d6) δ 10.21 (s, 1H), 8.65 (d, J=3.9 Hz, 1H), 8.18-8.34(m, 2H), 7.73 (dd, J=9.0, 2.4 Hz, 1H), 7.48 (br. s, 1H), 7.20 (d, J=11.4Hz, 1H), 4.30 (br. s, 2H), 4.15 (d, J=6.6 Hz, 1H), 3.93 (br. s, 3H),3.78 (m, 3H). 3.30 (t, J=4.2 Hz, 2H), 2.86 (br. s, 3H), 1.01-1.30 ppm(m, 6H).

Example-81: Synthesis of5-fluoro-N-(3-fluoro-4-(hexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine.(Compound 473)

Step-1: Synthesis of2-(2-fluoro-4-nitrophenypoctahydropyrrolo[1,2-a]pyrazine: To a stirredsolution of 1,2-difluoro-4-nitrobenzene (1000 mg, 6.28 mmol, 1 equiv) inDMF (10 mL), was added octahydropyrrolo[1,2-a]pyrazine (950 mg, 7.54mmol, 1.2 equiv) followed by addition of K₂CO₃ (1300 mg, 9.42 mmol, 1.5equiv). Resultant mixture was allowed to stir at 100° for overnight.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the mixture was diluted with water (20 mL), and wasextracted with EtOAc (25 mL). Organic layer was washed with water (20mL×6) and brine (5 mL), dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound wastriturated from hexane to afford2-(2-fluoro-4-nitrophenyl)octahydropyrrolo[1,2-a]pyrazine (1000 mg) as acolorless oil. LCMS: 267 [M+H]⁺

Step-2: Synthesis of3-fluoro-4-(hexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl)aniline: To astirred solution of2-(2-fluoro-4-nitrophenyl)octahydropyrrolo[1,2-a]pyrazine (1000 mg, 3.77mmol, 1 equiv) in ethanol (8 mL), water (3 mL), was added iron fillings(2000 mg, 37.7 mmol, 10 equiv) and ammonium chloride (2000 mg, 37.7mmol, 10 equiv). The resultant reaction mixture was allowed to stir at90° C. for 2 h. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, the mixture was concentrated undervacuum diluted with water (20 mL) and extracted with EtoAc (20 mL).Organic layer was washed with water (10 mL) and brine (10 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain3-fluoro-4-(hexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl)aniline (800 mg,82%) as a dark brown solid compound. LCMS: 236 [M+H]⁺

Step-3: Synthesis of5-fluoro-N-(3-fluoro-4-(hexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(60 mg, 0.18 mmol, 1 equiv) in dioxane (4 mL), was added3-fluoro-4-(hexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl)aniline (51 mg, 0.24mmol, 1.2 equiv) and cesium carbonate (90 mg, 0.27 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 10 min, followed bythe addition of palladium acetate (6 mg, 0.018 mmol, 0.1 equiv) andBINAP (24 mg, 0.036 mmol, 0.2 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (10 mL) and extracted with ethyl acetate (10 mL). Organiclayer was washed with water (5 mL) and brine solution (5 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtain5-fluoro-N-(3-fluoro-4-(hexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(15 mg, 11%) as a yellow solid compound. LCMS: 525 [M+H]⁺; ¹HNMR: (400MHz, DMSO-d6) δ 10.16 (s, 1H), 9.83 (d, J=3.1 Hz, 1H), 9.74 (s, 1H),8.59 (d, J=3.9 Hz, 1H), 7.83 (dd, J=15.1,2.4 Hz, 1H), 7.40 (d, J=10.7Hz, 2H), 7.16 (d, J=11.5 Hz, 1H), 7.13-7.04 (m, 1H), 4.30 (t, J=4.2 Hz,2H), 4.16 (p, J=6.6 Hz, 1H), 3.90-3.83 (m, 1H), 3.66 (dd, J=19.4, 12.3Hz, 2H), 3.45 (dd, J=26.2, 11.2 Hz, 2H), 3.34 (s, 14H), 3.17 (t, J=3.8Hz, 1H), 3.12-2.91 (m, 2H), 2.23-1.95 (m, 4H), 1.63 (t, J=10.2 Hz, 0H),1.19 (d, J=6.5 Hz, 7H).

Example-82 Synthesis of1-(4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazin-1-yl)ethan-1-one.(Compound 474)

Step-1: Synthesis 1-(4-(6-nitropyridin-3-yl) piperazin-1-yl)ethan-1-one: To a stirred solution of 5-bromo-2-nitropyridine (500 mg,2.47 mmol, 1 equiv) in DMSO (10 mL), was added TEA (0.7 mL, 4.9 mmol,1.5 equiv) and 1-(piperazin-1-yl)ethan-1-one (474 mg, 3.7 mmol, 1.2equiv). The resultant reaction mixture was allowed to stir at 120° C.for overnight. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, the mixture was diluted with ice water(50 mL) and extracted with ethyl acetate (100 mL). Organic layer waswashed with water (50 mL) and brine solution (50 mL). Organic layer wasdried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain to obtain 1-(4-(6-nitropyridin-3-yl) piperazin-1-yl)ethan-1-one (250 mg, 40%) as a brown solid compound. LCMS: 251 [M+H]⁺

Step-2: Synthesis of 1-(4-(6-aminopyridin-3-yl) piperazin-1-yl)ethan-1-one: To a stirred solution of1-(4-(6-nitropyridin-3-yl)piperazin-1-yl)ethan-1-one (250 mg, 1 mmol, 1equiv) in ethanol (6 mL), water (2 mL), was added iron powder (168 mg, 3mmol, 3 equiv) and ammonium chloride (108 mg, 2 mmol, 2 equiv). Theresultant reaction mixture was allowed to stir at 90° for 1 h. Progressof the reaction was monitored by TLC and LCMS. After completion of thereaction, the mixture was passes through celite bed and the filtrate wasconcentrated under reduced pressure to obtain1-(4-(6-aminopyridin-3-yl)piperazin-1-yl)ethan-1-one (200 mg, 91%) as adark brown color solid compound. LCMS: 221 [M+H]⁺

Step-3: Synthesis of1-(4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazin-1-yl)ethan-1-one:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added1-(4-(6-aminopyridin-3-yl)piperazin-1-yl)ethan-1-one (73 mg, 0.33 mmol,1.1 equiv) and cesium carbonate (147 mg, 0.45 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtain1-(4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazin-1-yl)ethan-1-one(10 mg, 6%) as an off white color solid compound. LCMS: 510 [M+H]³⁰ ;¹HNMR (400 MHz, DMSO-d₆) δ 9.73 (s, 1H), 8.57 (d, J=3.9 Hz, 1H),7.98-8.11 (m, 2H), 7.36-7.50 (m, 2H), 7.17 (d, J=11.0 Hz, 1H), 4.30 (br.s, 2H), 4.15 (br. s, 1H), 3.59 (br. s, 4H), 3.31 (d, J=4.6 Hz, 2H), 3.13(br. s, 2H), 3.07 (br. s, 2H), 2.05 (s, 3H), 1.19 ppm (d, J=6.6 Hz,6H).

Example-83 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(4-(methylsulfonyl)piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine.(Compound 475)

Step-1: Synthesis of1-(methylsulfonyl)-4-(6-nitropyridin-3-yl)piperazine: To a cooledsuspension of 1-(6-nitropyridin-3-yl)piperazine (1600 mg, 6.55 mmol, 1equiv) in DCM (30 mL) was added TEA (3.5 mL, 19.65 mmol, 3 equiv) at 0°C. followed by addition of mesyl chloride (905 mg, 7.85 mmol, 1.2 equiv)at 0° C. Resultant mixture was allowed to stir at room temperature for16 h. Progress of the reaction was monitored by LCMS. After completionof the reaction, the reaction mixture was diluted with water (20 mL) andextracted with DCM (30 mL). Organic layer was washed with water (20mL×3) and brine (5 mL), dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain1-(methylsulfonyl)-4-(6-nitropyridin-3-yl)piperazine (1600 mg) as anoil. LCMS: 588 [M+H]⁺

Step-2: Synthesis of5-(4-(methylsulfonyl)piperazin-1-yl)pyridin-2-amine: To a stirredsolution of 1-(methylsulfonyl)-4-(6-nitropyridin-3-yl)piperazine (1000mg, 3.5 mmol, 1 equiv) in ethanol (8 mL), water (3 mL), was added ironfillings (1900 mg, 35 mmol, 10 equiv) and ammonium chloride (1960 mg, 35mmol, 10 equiv). The resultant reaction mixture was allowed to stir at80° C. for 2 h. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, the mixture was concentrated undervacuum diluted with water (20 mL) and extracted with EtoAc (20 mL).Organic layer was washed with water (10 mL) and brine (10 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain5-(4-(methylsulfonyl)piperazin-1-yl)pyridin-2-amine (800 mg, 82%) as adark brown solid compound. LCMS: 257 [M+H]⁺

Step-3: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(4-(methylsulfonyl)piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(37 mg, 0.11 mmol, 1 equiv) in dioxane (3 mL), was added5-(4-(methylsulfonyl)piperazin-1-yl)pyridin-2-amine (32 mg, 0.13 mmol,1.2 equiv) and cesium carbonate (71 mg, 0.22 mmol, 2 equiv). Thereaction mixture was degassed by nitrogen gas for 10 min, followed bythe addition of palladium acetate (2.4 mg, 0.011 mmol, 0.1 equiv) andBINAP (14 mg, 0.022 mmol, 0.2 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (10 mL) and extracted with ethyl acetate (10 mL). Organiclayer was washed with water (5 mL) and brine solution (5 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(4-(methylsulfonyl)piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine(5 mg, 8%) as a yellow solid compound. LCMS: 546 [M+H]³⁰ ; ¹HNMR: (400MHz, CHLOROFORM-d) δ 8.24 (t, J=7.3 Hz, 1H), 7.90 (s, 1H), 7.35 (s, 1H),7.31 (s, OH), 7.22 (d, J=12.6 Hz, 1H), 4.30 (t, J=4.4 Hz, 1H), 4.12 (s,OH), 3.32 (d, J=10.8 Hz, 53H), 3.21 (s, 2H), 2.80 (s, 1H), 1.18 (d,J=6.4 Hz, 4H).

Example-84 Synthesis of 5-fluoro-N-(3-fluoro-4-(1-methylpiperidin-4-yl)phenyl)-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine.(Compound 476)

Step-1: Synthesis of6-bromo-8-fluoro-4-isobutyl-2H-benzo[b][1,4]oxazin-3(4H)-one: To astirred solution of 6-bromo-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one(2500 mg, 10.1 mmol, 1 equiv) in DMF (20 mL), was added K₂CO₃ (2801 mg,20.3 mmol, 2 equiv) and 1-iodo-2-methylpropane (2.3 mL, 20.3 mmol, 2equiv). The reaction mixture was allowed to stir at 80° C. for 3 h.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the reaction mixture was diluted with water (100 mL)and extracted with ethyl acetate (150 mL×2). Organic layer was washedwith water (100 mL), dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain6-bromo-8-fluoro-4-isobutyl-2H-benzo[b][1,4]oxazin-3(4H)-one (2300 mg,75%) as a brown color solid compound. LCMS: 302 [M+H]⁺

Step-2: Synthesis of6-bromo-8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazine: To astirred solution of6-bromo-8-fluoro-4-isobutyl-2H-benzo[b][1,4]oxazin-3(4H)-one (2000 mg,6.6 mmol, 1 equiv) in THF (20 mL), was added BH₃.DMS (2M in THF) (13 mL,26.6 mmol, 4 equiv) at 0° C. drop wise. The reaction mixture was allowedto stir at 60° C. for overnight. Progress of the reaction was monitoredby TLC and LCMS. After completion of the reaction, the reaction mixturewas quenched with saturated solution of NaHCO3 (100 mL) and extractedwith ethyl acetate (100 mL×2). Organic layer was washed with water (100mL), dried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain6-bromo-8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazine (1800mg, 94%) as a transparent oily compound. LCMS: 288 [M+H]⁺

Step-3: Synthesis of8-fluoro-4-isobutyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine:To a stirred solution of6-bromo-8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazine (1800mg, 6.27 mmol, 1 equiv) in dioxane (20 mL), was added4,4,5,5-tetramethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,2-dioxaborolane(2390 mg, 9.4 mmol, 1.5 equiv), Potassium acetate (1536 mg, 15.6 mmol,2.5 equiv) and). Purged the reaction mixture with nitrogen gas for 15min, Pd(dppf)Cl2. DCM (256 mg, 0.78 mmol, 0.05 equiv) was added to abovemixture and the reaction mixture was allowed to stir at 100° C. for 3 h.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the reaction mixture was diluted with water (100 mL)and extracted with ethyl acetate (150 mL×2). Organic layer was washedwith brine (150 mL) and water (150 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain8-fluoro-4-isobutyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(2000 mg, 95%) as a dark brown viscous compound. LCMS: 336 [M+H]⁺

Step-4: Synthesis of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazine:To a stirred solution of 2,4-dichloro-5-fluoropyrimidine (1000 mg, 6.02mmol, 1 equiv) in THF: Water (1:1=20 mL) was added8-fluoro-4-isobutyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(2018 mg, 6.02 mmol, 1 equiv), Potassium carbonate (1662 mg, 12.04 mmol,2 equiv) and Pd(PPh₃)₄ (347 mg, 0.3 mmol, 0.05 equiv). The reactionmixture was allowed to stir at 80° C. for 4 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (100 mL) and extracted withethyl acetate (150 mL×2). Organic layer was washed with water (100 mL)and brine (100 mL). Organic layer was dried over anhydrous sodiumsulphate and concentrated under reduced pressure to obtain crudecompound, which was purified by normal phase combi-flash to obtain6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(1300 mg, 64%) as a yellow solid compound. LCMS: 340 [M+H]⁺

Step-5: Synthesis of tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(70 mg, 0.2 mmol, 1 equiv) in Dioxane (5 mL), was added tert-butyl4-(4-amino-2-fluorophenyl)piperidine-1-carboxylate (63 mg, 0.22 mmol,1.1 equiv) and cesium carbonate (98 mg, 0.3 mmol, 1.5 equiv). Thereaction mixture was purged with nitrogen gas for 30 min, followed bythe addition of palladium acetate (1 mg, 0.008 mmol, 0.02 equiv) andBINAP (5 mg, 0.004 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brine(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound, which waspurified by normal phase combi flash to obtain tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperidine-1-carboxylate(100 mg, 83%) as a yellow solid compound. LCMS: 598 [M+H]⁺

Step-6: Synthesis of 5-fluoro-N-(3-fluoro-4-(piperidin-4-yl)phenyl)-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:tert-butyl4-(2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)piperidine-1-carboxylate(100 mg, 0.16 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure and the residuewas dried under lyophilizer to obtain crude compound, which was purifiedby making HCl salt to afford5-fluoro-N-(3-fluoro-4-(piperidin-4-yl)phenyl)-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(90 mg, 83%) as a yellow color solid compound. LCMS: 498 [M+H]⁺

Step-7: Synthesis of 5-fluoro-N-(3-fluoro-4-(1-methylpiperidin-4-yl)phenyl)-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a stirred solution of5-fluoro-N-(3-fluoro-4-(piperidin-4-yl)phenyl)-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(70 mg, 0.14 mmol, 1 equiv) in DCE (5 mL), was added Formaldehyde (40%in water) (0.02 mL, 0.42 mmol, 3 equiv), acetic acid (0.04 mL, 0.72mmol, 5 equiv). The reaction mixture was allowed to stir at RT for 1 h.The reaction mixture was cooled to 0° C. NaCNBH₃ (27 mg, 0.43 mmol, 3equiv) was added to above mixture and raise the temperature to RT. Thereaction mixture was allowed to stir at RT for 1 h. Progress of thereaction was monitored by LCMS. After completion of the reaction, thereaction mixture was diluted with water (25 mL) and extracted with ethylacetate (50 mL×2). Organic layer was washed with water (50 mL) and brinesolution (50 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by reverse phase HPLC to afford5-fluoro-N-(3-fluoro-4-(1-methylpiperidin-4-yl)phenyl)-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(5 mg, 7%) as a yellow solid compound. LCMS: 512 [M+H]³⁰ ; ¹HNMR (400MHz, DMSO-d₆) δ 9.93 (s, 1H), 8.61 (d, J=3.9 Hz, 1H), 7.78 (d, J=13.6Hz, 1H), 7.46 (d, J=7.5 Hz, 1H), 7.21-7.32 (m, 2H), 7.01-7.21 (m, 1H),4.30 (br. s, 2H), 3.47 (br. s, 2H), 3.33 (br. s, 2H), 3.13 (d, J=6.6 Hz,2H), 2.85 (br. s, 2H), 2.67 (br. s, 3H), 2.08 (d, J=6.1 Hz, 2H), 1.86(br. s, 4H), 0.90 ppm (d, J=6.6 Hz, 6H).

Example-85 Synthesis ofN-(5-(1,4-diazepan-1-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine.(Compound 477)

Step-1: Synthesis tert-butyl4-(6-nitropyridin-3-yl)-1,4-diazepane-1-carboxylate: To a stirredsolution of 1,2-difluoro-4-nitrobenzene (500 mg, 2.47 mmol, 1 equiv) inDMSO (10 mL), was added K₂CO₃ (682 mg, 4.9 mmol, 2 equiv) and tert-butyl1,4-diazepane-1-carboxylate (743 mg, 3.76 mmol, 1.5 equiv). Theresultant reaction mixture was allowed to stir at 100° C. for overnight.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the mixture was diluted with ice water (50 mL) andextracted with ethyl acetate (150 mL). Organic layer was washed withwater (50 mL) and brine solution (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain to obtain tert-butyl4-(6-nitropyridin-3-yl)-1,4-diazepane-1-carboxylate (550 mg, 69%) as abrown oily compound.

LCMS: 323 [M+H]⁺

Step-2: Synthesis of tert-butyl4-(6-aminopyridin-3-yl)-1,4-diazepane-1-carboxylate: To a stirredsolution of tert-butyl4-(6-nitropyridin-3-yl)-1,4-diazepane-1-carboxylate (550 mg, 1.7 mmol, 1equiv) in ethanol (6 mL), water (2 mL), was added iron powder (287 mg,5.12 mmol, 3 equiv) and ammonium chloride (184 mg, 3.4 mmol, 2 equiv).The resultant reaction mixture was allowed to stir at 90° for 1 h.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the mixture was passes through celite bed and thefiltrate was concentrated under reduced pressure to obtain tert-butyl4-(6-aminopyridin-3-yl)-1,4-diazepane-1-carboxylate (400 mg, 80%) as adark brown color viscous compound. LCMS: 293 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-1,4-diazepane-1-carboxylate;To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(6-aminopyridin-3-yl)-1,4-diazepane-1-carboxylate (96 mg, 0.33 mmol,1.1 equiv) and cesium carbonate (147 mg, 0.45 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtain tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-1,4-diazepane-1-carboxylate(50 mg, 28%) as a yellow color solid compound. LCMS: 582 [M+H]⁺

Step-4: Synthesis ofN-(5-(1,4-diazepan-1-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-1,4-diazepane-1-carboxylate(35 mg, 0.06 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at RT for 1 h.Solvent was removed under reduced pressure and the residue was driedunder lyophilizer to obtainN-(5-(1,4-diazepan-1-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(HCl salt) (30 mg, 97%) as a yellow color solid compound. LCMS: 482[M+H]³⁰ ; ¹HNMR (400 MHz, DMSO-d₆) δ 6 9.26 (br. s, 1H), 8.72 (d, J=3.1Hz, 1H), 7.86 (br. s, 1H), 7.68-7.84 (m, 2H), 7.39 (s, 1H), 7.19 (d,J=11.4 Hz, 1H), 4.31 (d, J=3.5 Hz, 2H), 4.06-4.21 (m, 1H), 3.77 (br. s,2H), 3.53 (br. s, 2H), 3.28-3.37 (m, 4H), 3.16 (br. s, 2H), 2.11 (br. s,2H), 1.06-1.26 ppm (m, 6H).

Example-86 Synthesis of N-(5-(1,4-diazepan-1-yl)pyridin-2-yl)-4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-amine.(Compound 478)

Step-1: Synthesis of tert-butyl4-(6-nitropyridin-3-yl)-1,4-diazepane-1-carboxylate: To a stirredsolution of 1,2-difluoro-4-nitrobenzene (500 mg, 2.47 mmol, 1 equiv) inDMSO (10 mL), was added K₂CO₃ (682 mg, 4.9 mmol, 2 equiv) and tert-butyl1,4-diazepane-1-carboxylate (743 mg, 3.76 mmol, 1.5 equiv). Theresultant reaction mixture was allowed to stir at 100° C. for overnight.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the mixture was diluted with ice water (50 mL) andextracted with ethyl acetate (150 mL). Organic layer was washed withwater (50 mL) and brine solution (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain to obtain tert-butyl4-(6-nitropyridin-3-yl)-1,4-diazepane-1-carboxylate (550 mg, 69%) as abrown oily compound. LCMS: 323 [M+H]⁺

Step-2: Synthesis of tert-butyl4-(6-aminopyridin-3-yl)-1,4-diazepane-1-carboxylate: To a stirredsolution of tert-butyl4-(6-nitropyridin-3-yl)-1,4-diazepane-1-carboxylate (550 mg, 1.7 mmol, 1equiv) in ethanol (6 mL), water (2 mL), was added iron powder (287 mg,5.12 mmol, 3 equiv) and ammonium chloride (184 mg, 3.4 mmol, 2 equiv).The resultant reaction mixture was allowed to stir at 90° for 1 h.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the mixture was passes through celite bed and thefiltrate was concentrated under reduced pressure to obtain tert-butyl4-(6-aminopyridin-3-yl)-1,4-diazepane-1-carboxylate (400 mg, 80%) as adark brown color viscous compound. LCMS: 293 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(6-((4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)pyridin-3-yl)-1,4-diazepane-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(6-aminopyridin-3-yl)-1,4-diazepane-1-carboxylate (92 mg, 0.33 mmol,1.1 equiv) and cesium carbonate (147 mg, 0.45 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtain tert-butyl4-(6-((4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)pyridin-3-yl)-1,4-diazepane-1-carboxylate(20 mg, 12%) as a yellow color solid compound. LCMS: 608 [M+H]³⁰

Step-4: Synthesis of N-(5-(1,4-diazepan-1-yl)pyridin-2-yl)-4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-amine:tert-butyl4-(6-((4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)pyridin-3-yl)-1,4-diazepane-1-carboxylate(mg, mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL) and theresultant reaction mixture was allowed to stir at RT for 1 h. Solventwas removed under reduced pressure and the residue was dried underlyophilizer to obtainN-(5-(1,4-diazepan-1-yl)pyridin-2-yl)-4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-amine(HCl salt) (7 mg, 78%) as a yellow color solid compound. LCMS: 508[M+H]⁺; ¹HNMR (400 MHz, DMSO-d6) 6 9.12 (br. s, 1H), 8.69 (br. s, 1H),7.84 (br. s, 3H), 7.43 (br. s, 1H), 7.20 (d, J=10.1 Hz, 1H), 4.33 (br.s, 2H), 4.26 (br. s, 1H), 3.76 (br. s, 2H), 3.52 (d, J=5.3 Hz, 1H), 3.35(br. s, 3H), 3.26 (br. s, 2H), 3.17 (br. s, 3H), 2.10 (br. s, 2H), 1.88(br. s, 1H), 1.71 (br. s, 2H), 1.62 ppm (br. s, 4H).

Example 87 Synthesis of5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine.(Compound 479)

Step-1: Synthesis of tert-butyl4-(6-C₅-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(70 mg, 0.2 mmol, 1 equiv) in Dioxane (5 mL), was added tert-butyl4-(6-aminopyridin-3-yl)piperidine-1-carboxylate (63 mg, 0.22 mmol, 1.1equiv) and cesium carbonate (98 mg, 0.3 mmol, 1.5 equiv). The reactionmixture was purged with nitrogen gas for 30 min, followed by theaddition of palladium acetate (1 mg, 0.008 mmol, 0.02 equiv) and BINAP(5 mg, 0.004 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brine(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound, which waspurified by normal phase combi flash to obtain tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidine-1-carboxylate(100 mg, 83%) as a yellow solid compound. LCMS: 581 [M+H]⁺

Step-2: Synthesis of5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine:tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidine-1-carboxylate(100 mg, 0.17 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure and the residuewas dried under lyophilizer to obtain crude compound, which was purifiedby making HCl salt to afford5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine(70 mg, 84%) as a yellow color solid compound. LCMS: 481 [M+H]⁺

Step-3: Synthesis of5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine:To a stirred solution of5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine(70 mg, 0.14 mmol, 1 equiv) in DCE (3 mL), was added Formaldehyde (40%in water) (0.02 mL, 0.42 mmol, 3 equiv), acetic acid (0.04 mL, 0.72mmol, 5 equiv). The reaction mixture was allowed to stir at RT for 1 h.The reaction mixture was cooled to 0° C. NaCNBH₃ (27 mg, 0.42 mmol, 3equiv) was added to above mixture and raise the temperature to RT. Thereaction mixture was allowed to stir at RT for 1 h. Progress of thereaction was monitored by LCMS. After completion of the reaction, thereaction mixture was diluted with water (25 mL) and extracted with ethylacetate (50 mL×2). Organic layer was washed with water (50 mL) and brinesolution (50 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by reverse phase HPLC to afford5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine(3 mg, 4%) as a yellow color solid compound. LCMS: 495 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d₆) δ 9.88 (s, 1H), 8.61 (d, J=3.5 Hz, 1H), 8.32 (br. s,1H), 8.05-8.21 (m, 1H), 7.63 (d, J=8.8 Hz, 1H), 7.29 (br. s, 1H), 7.16(d, J=11.4 Hz, 1H), 4.30 (br. s, 2H), 3.46 (br. s, 2H), 3.13 (d, J=7.5Hz, 2H), 2.96 (br. s, 1H), 2.85 (br. s, 1H), 2.19 (s, 3H), 2.05 (d,J=14.5 Hz, 1H), 1.96 (t, J=10.1 Hz, 1H), 1.54-1.77 (m, 4H), 1.45 (br. s,2H), 0.91 ppm (d, J=6.6 Hz, 6H).

Example-88 Synthesis of N-(4-(4-(dimethylamino)piperidin-1-yl)-3-fluorophenyl)-5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine.(Compound480)

To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.29 mmol, 1 equiv) in Dioxane (5 mL), was added1-(4-amino-2-fluorophenyl)-N,N-dimethylpiperidin-4-amine (76 mg, 0.32mmol, 1.1 equiv) and cesium carbonate (141 mg, 0.43 mmol, 1.5 equiv).The reaction mixture was purged with nitrogen gas for 30 min, followedby the addition of palladium acetate (1.3 mg, 0.005 mmol, 0.02 equiv)and BINAP (7 mg, 0.01 mmol, 0.04 equiv). The resultant reaction mixturewas allowed to stir at 100° C. for overnight. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brine(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound, which waspurified by reverse phase HPLC to obtainN-(4-(4-(dimethylamino)piperidin-1-yl)-3-fluorophenyl)-5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(12 mg, 8%) as a yellow solid compound. LCMS: 541 [M+H]³⁰ ; ¹HNMR (400MHz, DMSO-d₆) δ 9.72 (s, 1H), 8.56 (d, J=3.9 Hz, 1H), 7.68 (s, 1H), 7.71(s, 1H), 7.39 (d, J=7.5 Hz, 1H), 7.12 (d, J=11.4 Hz, 1H), 6.86-7.01 (m,1H), 4.29 (br. s, 2H), 3.46-3.33 (br. s, 4H), 3.13 (d, J=6.6 Hz, 2H),2.52-2.76 (m, 3H), 2.21 (s, 6H), 2.05 (d, J=6.6 Hz, 1H), 1.83 (d, J=11.0Hz, 2H), 1.53 (d, J=12.3 Hz, 2H), 0.90 ppm (d, J=6.6 Hz, 6H).

Example-89 SynthesisN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-5,6,7,8-tetrahydro-1,6-naphthyridin-2-amine.(Compound 481)

Step-1: Synthesis of tert-butyl2-chloro-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate: To thesolution of 2-chloro-5,6,7,8-tetrahydro-1,6-naphthyridine (2000 mg,11.9mo1, lequiv), taken in DCM (30 mL), was added DIPEA (1.84g, 14.28mmol, 1.2equiv) At 0° C. then was added Boc Anhydride (2.850 mg,18.08mmol, 1.1 equiv),Resulted reaction mixture was allow to stir RT for 2 h.Progress of Reaction was monitored by LCMs/TLC. After completion thereaction mixture was diluted with water and extracted with DCM (200 mL).organic layer was washed with water (30 mL) and brine solution(40 mL),resulted organic layer was dried over anhydrous sodium sulphate andpurified by combi-flash column to tert-butyl2-chloro-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate (2.2g of x %)as yellow colour solid LCMS: 269 [M+H]⁺

Step-2: Synthesis of tert-butyl2-((diphenylmethylene)amino)-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate:To the solution of tert-butyl2-chloro-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate (1g, 3.73mmo1,lequiv), taken in dioxane(20 mL) was added diphenylmethanimine (0.74g,4.13mmol, 1.lequiv), cesium carbonate (2.42 g, 7.46 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 5 min, followedby the addition of Pd2dba3 (340 mg, 0.37 mmol, 0.1 equiv) and xanthphos(740 mg,0.74 mmol, 0.2 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (50 mL) and extracted with ethyl acetate (200 mL). Organiclayer was washed with water (100 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to obtain tert-butyl2-((diphenylmethylene)amino)-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate(1.1 g)as a yellow solid compound. LCMS: 414 [M+H]⁺

Step-3: Synthesis of tert-butyl2-amino-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate: To a solutionof tert-butyl2-((diphenylmethylene)amino)-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate(1469 mg, 3.5mmol,1equiv) taken in methanol(25 mL), was addedhydroxylamine hydrochloride (476 mg, 7 mmol, 2equiv) ,resulted reactionmixture allowed to stir at RT for 3 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (20 mL) and brine solution (30 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to obtain tert-butyl2-((diphenylmethylene)amino)-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate(0.57 g of 95.83%) as a yellow solid compound LCMS: 250 [M+H]⁺

Step-4: Synthesis of tert-butyl2-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.31 mmol, 1 equiv) in dioxane (4 mL), was added tert-butyl2-((diphenylmethylene)amino)-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate(84 mg, 0.33 mmol, 1.2 equiv) and cesium carbonate (151 mg, 0.46 mmol,1.5 equiv). The reaction mixture was degassed by nitrogen gas for 10min, followed by the addition of palladium acetate (7 mg, 0.031 mmol,0.1 equiv) and BINAP (39 mg, 0.062 mmol, 0.2 equiv). The resultantreaction mixture was allowed to stir at 100° C. for 16 h. Progress ofthe reaction was monitored by TLC and LCMS. After completion of thereaction, diluted with water (10 mL) and extracted with ethyl acetate(10 mL). Organic layer was washed with water (5 mL) and brine solution(5 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain tert-butyl2-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate(135 mg crude). Used directly for next step LCMS: 539 [M+H]⁺

Step-5: Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-5,6,7,8-tetrahydro-1,6-naphthyridin-2-amine:A solution of tert-butyl2-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate(135 mg crude) in 1.25 M HCl in ethanol (5 mL) was allowed to stir for 1h at 50° C. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, solvent was removed under reduced pressureto obtain crude which was purified by reverse phase HPLC to affordN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-5,6,7,8-tetrahydro-1,6-naphthyridin-2-amine(20 mg) as a pale yellow solid compound. LCMS: 439 [M+H]³⁰ ; ¹HNMR: (400MHz, DMSO-d6) δ 9.83 (s, 1H), 8.59 (d, J=4.0 Hz, 1H), 8.30-8.20 (m,1H),8.01 (d, J=8.4 Hz, 1H), 7.51 (s, 1H), 7.41 (d, J=8.5 Hz, 1H), 7.19 (d,J=11.6 Hz, 1H), 4.30 (t, J=4.3 Hz, 2H), 4.17 (p, J=6.5 Hz, 1H), 3.86 (s,2H), 3.34-3.20 (m, 4H), 3.07 (s, 2H), 2.74 (t, J=5.8 Hz, 2H), 1.19 (d,J=6.5 Hz, 7H).

Example-90 Synthesis ofN-(4-(4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)-5,6,7,8-tetrahydro-1,6-naphthyridin-2-amine.(Compound 482)

Step-1: Synthesis of6-bromo-4-cyclobutyl-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one: To astirred solution of 6-bromo-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one(2500 mg, 10.1 mmol, 1 equiv) in DMF (20 mL), was added CS₂CO₃ (6618 mg,20.3 mmol, 2 equiv) and bromocyclobutane (1.9 mL, 20.3 mmol, 2 equiv).The reaction mixture was allowed to stir at 80° C. for overnight.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the reaction mixture was diluted with water (100 mL)and extracted with ethyl acetate (150 mL×2). Organic layer was washedwith water (100 mL), dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain6-bromo-4-cyclobutyl-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one (2500 mg,82%) as a brown color viscous compound. LCMS: 300 [M+H]⁺

Step-2: Synthesis of6-bromo-4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine: To astirred solution of6-bromo-4-cyclobutyl-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one (2000 mg,6.6 mmol, 1 equiv) in THF (20 mL), was added BH₃.DMS (2M in THF) (13 mL,26.8 mmol, 4 equiv) at 0° C. drop wise. The reaction mixture was allowedto stir at 50° C. for overnight. Progress of the reaction was monitoredby TLC and LCMS. After completion of the reaction, the reaction mixturewas quenched with saturated solution of NaHCO₃ (100 mL) and extractedwith ethyl acetate (100 mL×2). Organic layer was washed with water (100mL), dried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain6-bromo-4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine (1100mg, 58%) as a transparent oily compound. LCMS: 286 [M+H]⁺

Step-3: Synthesis of4-cyclobutyl-8-fluoro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine:6-bromo-4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine (1100mg, 3.8 mmol, 1 equiv),4,4,5,5-tetramethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,2-dioxaborolane(1471 mg, 5.7 mmol, 1.5 equiv), Potassium acetate (931 mg, 9.5 mmol, 2.5equiv) and dioxane (15 mL) were charged in a 25 mL glass bottle. Purgedthe reaction mixture with nitrogen gas for 15 min, Pd(dppf)Cl2. DCM (155mg, 0.19 mmol, 0.05 equiv) was added to above mixture and the reactionmixture was allowed to stir at 100° C. for 3 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL×2). Organic layer was washed with brine (50 mL) andwater (50 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain4-cyclobutyl-8-fluoro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(1200 mg, 93%) as a dark brown viscous compound. LCMS: 334 [M+H]⁺

Step-4: Synthesis of6-(2-chloro-5-fluoropyrimidin-4-yl)-4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine: To a stirred solution of2,4-dichloro-5-fluoropyrimidine (600 mg, 3.16 mmol, 1 equiv) in THF:Water (1:1=16 mL) was added4-cyclobutyl-8-fluoro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine(1200 mg, 3.6 mmol, 1 equiv), Potassium carbonate (998 mg, 7.22 mmol, 2equiv) and Pd(PPh₃)₄ (208 mg, 0.18 mmol, 0.05 equiv). The reactionmixture was allowed to stir at 80° C. for 4 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL×2). Organic layer was washed with water (100 mL) andbrine (100 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude compound, whichwas purified by normal phase combi-flash to obtain6-(2-chloro-5-fluoropyrimidin-4-yl)-4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine(500 mg, 41%) as a yellow color solid compound. LCMS: 338 [M+H]⁺

Step-5: Synthesis of1-(2-((4-(4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)-7,8-dihydro-1,6-naphthyridin-6(5H)-yl)-2,2-dimethylpropan-1-one:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.29 mmol, 1 equiv) in Dioxane (5 mL), was added tert-butyl2-amino-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate (81 mg, 0.32mmol, 1.1 equiv) and cesium carbonate (142 mg, 0.43 mmol, 1.5 equiv).The reaction mixture was purged with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (7 mg, 0.013 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brine(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound, which waspurified by normal phase combi flash to obtain1-(2-((4-(4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)-7,8-dihydro-1,6-naphthyridin-6(5H)-yl)-2,2-dimethylpropan-1-one(100 mg, 61%) as a yellow color solid compound. LCMS: 551 [M+H]⁺

Step-6: Synthesis ofN-(4-(4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)-5,6,7,8-tetrahydro-1,6-naphthyridin-2-amine:1-(2-((4-(4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)-7,8-dihydro-1,6-naphthyridin-6(5H)-yl)-2,2-dimethylpropan-1-one(100 mg, 0.18 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure to obtain theresidue, which was purified by reverse phase HPLC to obtainN-(4-(4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)-5,6,7,8-tetrahydro-1,6-naphthyridin-2-amine(20 mg, 24%) as a light orange color solid compound. LCMS: 451 [M+H] ³⁰; ¹HNMR (400 MHz, DMSO-d₆) δ 10.12 (s, 1H), 9.04 (br. s, 1H), 8.64 (d,J=3.9 Hz, 1H), 8.15 (d, J=8.3 Hz, 1H), 7.64 (d, J=8.8 Hz, 1H), 7.36 (s,1H), 7.27 (s, 1H), 4.37 (d, J=3.9 Hz, 2H), 4.27 (br. s, 2H), 3.89-4.09(m, 1H), 3.51 (br. s, 2H), 3.31 (br. s, 2H), 3.01 (t, J=5.7 Hz, 2H),2.27 (br. s, 2H), 2.14 (d, J=11.0 Hz, 2H), 1.73 ppm (dt, J=9.4, 4.9 Hz,2H).

Example-91 Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-5,6,7,8-tetrahydro-1,6-naphthyridin-2-amine.(Compound 483)

Step-1: Synthesis of tert-butyl2-((5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.31 mmol, 1 equiv) in dioxane (4 mL), was added tert-butyl2-amino-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate (81 mg, 0.33mmol, 1.1 equiv) and cesium carbonate (188 mg, 0.58 mmol, 2 equiv). Thereaction mixture was degassed by nitrogen gas for 10 min, followed bythe addition of palladium acetate (7 mg, 0.03 mmol, 0.1 equiv) and BINAP(36 mg, 0.06 mmol, 0.2 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for 16 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (10 mL) and extracted with ethyl acetate (10 mL). Organiclayer was washed with water (5 mL) and brine solution (5 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain tert-butyl2-((5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate(135 mg crude). Used directly for next step. LCMS: 553 [M+H]⁺

Step-2: Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-5,6,7,8-tetrahydro-1,6-naphthyridin-2-amine:A solution of tert-butyl2-((5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate(135 mg crude) in 1.25 M HCl in ethanol (5 mL) was allowed to stir for 1h at 50° C. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, solvent was removed under reduced pressureto obtain crude which was purified by reverse phase HPLC to affordN-(5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-5,6,7,8-tetrahydro-1,6-naphthyridin-2-amine(10 mg) as a pale yellow solid compound. LCMS: 453 [M+H]³⁰ ; ¹HNMR: (400MHz, DMSO-d6) δ 9.74 (s, 1H), 8.57 (d, J=4.0 Hz, 1H), 8.29 (s, 1H), 7.72(dd, J=15.3,2.5 Hz, 1H), 7.44 (s, 1H), 7.36 (dd, J=8.8, 2.5 Hz, 1H),7.16 (d, J=11.4 Hz, 1H), 6.97 (t, J=9.4 Hz,1H), 4.30 (t, J=4.4 Hz, 2H),4.16 (p, J=6.6 Hz, 1H), 3.30 (dd, J=9.6, 5.2 Hz, 4H), 2.63-2.54 (m, 2H),2.22 (s, 7H), 1.84 (dd, J=12.7, 3.6 Hz, 2H), 1.54 (tt, J=13.3, 6.7 Hz,2H), 1.18 (d,J=6.5 Hz, 6H).

Example-92 Synthesis of1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-4-methylpiperidin-4-ol.(Compound 484)

Step-1: Synthesis of 4-methyl-1-(6-nitropyridin-3-yl) piperidin-4-ol: Toa stirred solution of 5-bromo-2-nitropyridine (500 mg, 2.47 mmol, 1equiv) in DMSO (10 mL), was added K₂CO₃ (683 mg, 4.95 mmol, 2 equiv) and4-methylpiperidin-4-ol (427 mg, 3.7 mmol, 1.5 equiv). The resultantreaction mixture was allowed to stir at 100° C. for overnight. Progressof the reaction was monitored by LCMS. After completion of the reaction,diluted with water (50 mL), solid observed was filtered and dried undervacuum to obtain 4-methyl-1-(6-nitropyridin-3-yl)piperidin-4-ol (500 mg,85%) as a yellow solid compound. LCMS: 238 [M+H]⁺

Step-2: Synthesis of 1-(6-aminopyridin-3-yl)-4-methylpiperidin-4-ol: Toa stirred solution of 4-methyl-1-(6-nitropyridin-3-yl)piperidin-4-ol(200 mg, 0.84 mmol, 1 equiv) in methanol (10 mL), was added Pd/C (20%w/w) (40 mg). The resultant reaction mixture was allowed to stir at RTfor 1 h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the mixture was passes through celite bedand the filtrate was concentrated under reduced pressure to obtain1-(6-aminopyridin-3-yl)-4-methylpiperidin-4-ol (150 mg, 86%) as a whitecolor solid compound. LCMS: 208 [M+H]⁺

Step-3: Synthesis of1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-4-methylpiperidin-4-ol:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (3 mL), was added1-(6-aminopyridin-3-yl)-4-methylpiperidin-4-ol (68 mg, 0.33 mmol, 1.1equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv). The reactionmixture was degassed with nitrogen gas for 30 min, followed by theaddition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP(8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified byrecrystallization with methanol to obtain1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-4-methylpiperidin-4-ol(120 mg, 78%) as a yellow color solid compound. LCMS: 497 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d₆) δ 9.63 (s, 1H), 8.55 (d, J=3.9 Hz, 1H), 7.90-8.08 (m,2H), 7.46 (s, 1H), 7.37 (dd, J=9.0, 2.9 Hz, 1H), 7.17 (d, J=11.8 Hz,1H), 5.75 (s, 1H), 4.23-4.32 (m, 2H), 4.05-4.17 (m, 1H), 3.24 (d, J=12.3Hz, 4H), 2.97-3.12 (m, 2H), 1.57 (d, J=4.4 Hz, 4H), 1.05-1.30 ppm (m,9H).

Example-93 Synthesis of(1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-yl)methanol.(Compound 485)

Step-1: Synthesis of (1-(6-nitropyridin-3-yl) piperidin-4-yl) methanol:To a stirred solution of 5-bromo-2-nitropyridine (500 mg, 2.47 mmol, 1equiv) in DMSO (10 mL), was added K₂CO₃ (683 mg, 4.95 mmol, 2 equiv) andpiperidin-4-ylmethanol (427 mg, 3.71 mmol, 1.5 equiv). The resultantreaction mixture was allowed to stir at 100° C. for overnight. Progressof the reaction was monitored by LCMS. After completion of the reaction,diluted with water (50 mL), solid observed was filtered and dried undervacuum to obtain (1-(6-nitropyridin-3-yl)piperidin-4-yl)methanol (330mg, 56%) as a yellow solid compound. LCMS: 238 [M+H]hu +

Step-2: Synthesis of (1-(6-aminopyridin-3-yl) piperidin-4-yl) methanol:To a stirred solution of (1-(6-nitropyridin-3-yl) piperidin-4-yl)methanol (200 mg, 0.84 mmol, 1 equiv) in methanol (10 mL), was addedPd/C (20% w/w) (40 mg). The resultant reaction mixture was allowed tostir at RT for 1 h. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, the mixture was passes throughcelite bed and the filtrate was concentrated under reduced pressure toobtain (1-(6-aminopyridin-3-yl) piperidin-4-yl) methanol (150 mg, 86%)as a white color solid compound. LCMS: 208 [M+H]⁺

Step-3: Synthesis of(1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-yl)methanol:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(50 mg, 0.15 mmol, 1 equiv) in dioxane (3 mL), was added(1-(6-aminopyridin-3-yl)piperidin-4-yl)methanol (35 mg, 0.16 mmol, 1.1equiv) and cesium carbonate (73 mg, 0.23 mmol, 1.5 equiv). The reactionmixture was degassed with nitrogen gas for 30 min, followed by theaddition of palladium acetate (1 mg, 0.003 mmol, 0.02 equiv) and BINAP(4 mg, 0.006 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified byrecrystallization with methanol to obtain(1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-yl)methanol(8 mg, 11%) as a yellow color solid compound. LCMS: 497 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d₆) δ 9.64 (s, 1H), 8.55 (d, J=4.0 Hz, 1H), 8.03-7.95 (m,2H), 7.46 (s,1H), 7.37 (dd, J=9.1,3.2 Hz, 1H), 7.17 (d, J=11.7 Hz, 1H),4.49 (t, J=5.4 Hz, 1H), 4.33-4.26 (m,2H), 4.15 (p, J=6.6 Hz, 1H), 3.63(d, J=11.9 Hz, 2H), 3.30 (s, 3H), 2.68-2.57 (m, 2H), 1.81-1.72 (m,2H),1.48 (d, J=11.2 Hz, 2H), 1.27 (dt, J=12.2,6.4 Hz, 2H), 1.18 (d, J=6.5Hz, 6H).

Example-94 Synthesis of1-(6-((4-(4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-ol.(Compound486)

Step-1: Synthesis of 1-(6-nitropyridin-3-yl) piperidin-4-ol: To astirred solution of 5-bromo-2-nitropyridine (500 mg, 2.47 mmol, 1 equiv)in DMSO (10 mL), was added K₂CO₃ (683 mg, 4.95 mmol, 2 equiv) andpiperidin-4-ol (500 mg, 4.95 mmol, 2 equiv). The resultant reactionmixture was allowed to stir at 100° C. for overnight. Progress of thereaction was monitored by LCMS. After completion of the reaction,diluted with water (50 mL), solid observed was filtered and dried undervacuum to obtain 1-(6-nitropyridin-3-yl)piperidin-4-ol (400 mg, 73%) asa yellow solid compound. LCMS: 224 [M+H]⁺

Step-2; Synthesis of 1-(6-aminopyridin-3-yl) piperidin-4-ol: To astirred solution of 1-(6-nitropyridin-3-yl)piperidin-4-ol (400 mg, 1.79mmol, 1 equiv) in methanol (10 mL), was added Pd/C (20% w/w) (80 mg).The resultant reaction mixture was allowed to stir at RT for 1 h.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the mixture was passes through celite bed and thefiltrate was concentrated under reduced pressure to obtain1-(6-aminopyridin-3-yl) piperidin-4-ol (300 mg, 87%) as a white colorsolid compound. LCMS: 194 [M+H]⁺

Step-3: Synthesis of1-(6-((4-(4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-ol:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine(70 mg, 0.2 mmol, 1 equiv) in dioxane (3 mL), was added1-(6-aminopyridin-3-yl)piperidin-4-ol (44 mg, 0.22 mmol, 1.1 equiv) andcesium carbonate (98 mg, 0.3 mmol, 1.5 equiv). The reaction mixture wasdegassed with nitrogen gas for 30 min, followed by the addition ofpalladium acetate (1 mg, 0.004 mmol, 0.02 equiv) and BINAP (5 mg, 0.008mmol, 0.04 equiv). The resultant reaction mixture was allowed to stir at100° C. for overnight. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, diluted with water (30 mL) andextracted with ethyl acetate (100 mL). Organic layer was washed withwater (50 mL) and brine solution (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by recrystallization with methanol toobtain1-(6-((4-(4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-ol(30 mg, 30%) as a yellow color solid compound. LCMS: 495 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d₆) δ 9.65 (s, 1H), 8.56 (d, J=3.9 Hz, 1H), 7.90-8.08 (m,2H), 7.41 (dd, J=9.2, 2.6 Hz, 1H), 7.35 (s, 1H), 7.25 (d, J=12.7 Hz,1H), 4.69 (d, J=3.9 Hz, 1H), 4.36 (d, J=3.9 Hz, 2H), 3.87-4.09 (m, 1H),3.62 (d, J=3.9 Hz, 1H), 3.47 (d, J=11.8 Hz, 2H), 3.34 (s, 2H), 2.82 (t,J=9.6 Hz, 2H), 2.25 (br. s, 2H), 2.13 (d, J=9.2 Hz, 2H), 1.83 (d, J=10.1Hz, 2H), 1.61-1.75 (m, 2H), 1.50 ppm (d, J=9.2 Hz, 2H).

Example-95 Synthesis of4-(4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoro-N-(5-morpholinopyridin-2-yl)pyrimidin-2-amine.(Compound 487)

Step-1: Synthesis of 4-(6-nitropyridin-3-yl) morpholine: To a stirredsolution of 5-bromo-2-nitropyridine (500 mg, 2.47 mmol, 1 equiv) in DMSO(10 mL), was added TEA (0.7 mL, 4.94 mmol, 2 equiv) and morpholine (323mg, 3.7 mmol, 1.5 equiv). The resultant reaction mixture was allowed tostir at 100° C. for overnight. Progress of the reaction was monitored byTLC and LCMS. After completion of the reaction, diluted with water (50mL), solid observed was filtered and dried under vacuum to obtain4-(6-nitropyridin-3-yl)morpholine (400 mg, 77%) as a yellow solidcompound. LCMS: 210 [M+H]⁺

Step-2: Synthesis of 5-morpholinopyridin-2-amine: To a stirred solutionof 4-(6-nitropyridin-3-yl)morpholine (400 mg, 1.9 mmol, 1 equiv) inmethanol (10 mL), was added Pd/C (20% w/w) (80 mg). The resultantreaction mixture was allowed to stir at RT for 1 h. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, the mixture was passes through celite bed and the filtrate wasconcentrated under reduced pressure to obtain5-morpholinopyridin-2-amine (300 mg, 88%) as a white color solidcompound. LCMS: 180 [M+H]⁺

Step-3: Synthesis of4-(4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoro-N-(5-morpholinopyridin-2-yl)pyrimidin-2-amine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine(70 mg, 0.2 mmol, 1 equiv) in dioxane (3 mL), was added1-(6-aminopyridin-3-yl)piperidin-4-ol (39 mg, 0.22 mmol, 1.1 equiv) andcesium carbonate (98 mg, 0.3 mmol, 1.5 equiv). The reaction mixture wasdegassed with nitrogen gas for 30 min, followed by the addition ofpalladium acetate (1 mg, 0.004 mmol, 0.02 equiv) and BINAP (5 mg, 0.008mmol, 0.04 equiv). The resultant reaction mixture was allowed to stir at100° C. for overnight. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, diluted with water (30 mL) andextracted with ethyl acetate (100 mL). Organic layer was washed withwater (50 mL) and brine solution (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by recrystallization with methanol toobtain4-(4-cyclobutyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoro-N-(5-morpholinopyridin-2-yl)pyrimidin-2-amine(30 mg, 30%) as a yellow color solid compound. LCMS: 481 [M+H]³⁰ ; ¹HNMR(400 MHz, DMSO-d₆) δ 9.71 (s, 1H), 8.56 (d, J=3.5 Hz, 1H), 7.93-8.12 (m,2H), 7.43 (d, J=8.8 Hz, 1H), 7.35 (s, 1H), 7.26 (d, J=11.8 Hz, 1H), 4.37(br. s, 2H), 3.92-4.09 (m, 1H), 3.61-3.77 (m, 4H), 3.35 (s, 2H),2.98-3.18 (m, 4H), 2.25 (br. s, 2H), 1.99-2.20 (m, 2H), 1.58-1.81 ppm(m, 2H).

Example-96 Synthesis of1-(6-((5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-ol.(Compound 488)

Step-1: Synthesis of 1-(6-nitropyridin-3-yl) piperidin-4-ol: To astirred solution of 5-bromo-2-nitropyridine (500 mg, 2.47 mmol, 1 equiv)in DMSO (10 mL), was added K₂CO₃ (683 mg, 4.95 mmol, 2 equiv) andpiperidin-4-ol (500 mg, 4.95 mmol, 2 equiv). The resultant reactionmixture was allowed to stir at 100° C. for overnight. Progress of thereaction was monitored by LCMS. After completion of the reaction,diluted with water (50 mL), solid observed was filtered and dried undervacuum to obtain 1-(6-nitropyridin-3-yl)piperidin-4-ol (400 mg, 73%) asa yellow solid compound. LCMS: 224 [M+H]⁺

Step-2: Synthesis of 1-(6-aminopyridin-3-yl) piperidin-4-ol: To astirred solution of 1-(6-nitropyridin-3-yl)piperidin-4-ol (400 mg, 1.79mmol, 1 equiv) in methanol (10 mL), was added Pd/C (20% w/w) (80 mg).The resultant reaction mixture was allowed to stir at RT for 1 h.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the mixture was passes through celite bed and thefiltrate was concentrated under reduced pressure to obtain1-(6-aminopyridin-3-yl) piperidin-4-ol (300 mg, 87%) as a white colorsolid compound. LCMS: 194 [M+H]⁺

Step-3: Synthesis of1-(6-((5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-ol:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(80 mg, 0.23 mmol, 1 equiv) in dioxane (3 mL), was added1-(6-aminopyridin-3-yl)piperidin-4-ol (50 mg, 0.25 mmol, 1.1 equiv) andcesium carbonate (113 mg, 0.35 mmol, 1.5 equiv). The reaction mixturewas degassed with nitrogen gas for 30 min, followed by the addition ofpalladium acetate (1 mg, 0.005 mmol, 0.02 equiv) and BINAP (6 mg, 0.009mmol, 0.04 equiv). The resultant reaction mixture was allowed to stir at100° C. for overnight. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, diluted with water (30 mL) andextracted with ethyl acetate (100 mL). Organic layer was washed withwater (50 mL) and brine solution (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by recrystallization with methanol toobtain1-(6-((5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-ol(50 mg, 43%) as a yellow color solid compound. LCMS: 497 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d₆) δ 9.64 (s, 1H), 8.56 (d, J=3.9 Hz, 1H), 7.93-8.08 (m,2H), 7.38 (dd, J=9.0, 2.9 Hz, 1H), 7.25 (s, 1H), 7.14 (d, J=11.8 Hz,1H), 4.69 (d, J=3.9 Hz, 1H), 4.29 (br. s, 2H), 3.52-3.69 (m, 1H), 3.45(br. s, 4H), 3.12 (d, J=7.0 Hz, 2H), 2.82 (t, J=9.6 Hz, 2H), 1.98-2.14(m, 1H), 1.83 (d, J=9.2 Hz, 2H), 1.33-1.58 (m, 2H), 0.91 ppm (d, J=6.6Hz, 6H).

Example-97 Synthesis of5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-morpholinopyridin-2-yl)pyrimidin-2-amine.(Compound 489)

To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(80 mg, 0.23 mmol, 1 equiv) in dioxane (3 mL), was added1-(6-aminopyridin-3-yl)piperidin-4-ol (45 mg, 0.25 mmol, 1.1 equiv) andcesium carbonate (113 mg, 0.35 mmol, 1.5 equiv). The reaction mixturewas degassed with nitrogen gas for 30 min, followed by the addition ofpalladium acetate (1 mg, 0.005 mmol, 0.02 equiv) and BINAP (6 mg, 0.009mmol, 0.04 equiv). The resultant reaction mixture was allowed to stir at100° C. for overnight. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, diluted with water (30 mL) andextracted with ethyl acetate (100 mL). Organic layer was washed withwater (50 mL) and brine solution (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by reverse phase HPLC to obtain5-fluoro-4-(8-fluoro-4-isobutyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-morpholinopyridin-2-yl)pyrimidin-2-amine(60 mg, 53%) as a yellow color solid compound. LCMS: 483 [M+H]³⁰ ; ¹HNMR(400 MHz, DMSO-d₆) 6 9.69 (s, 1H), 8.57 (d, J=3.9 Hz, 1H), 7.89-8.11 (m,2H), 7.63 (br. s, 1H), 7.27 (s, 1H), 7.15 (d, J=11.0 Hz, 1H), 4.29 (br.s, 2H), 3.66-3.91 (m, 4H), 3.45 (br. s, 2H), 2.87-3.16 (m, 6H),1.89-2.13 (m, 1H), 0.91 ppm (d, J=6.6 Hz, 6H).

Example-98 Synthesis of2-(4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazin-1-yl)ethan-1-ol.(Compound 490)

Step-1: Synthesis of 2-(4-(6-nitropyridin-3-yl) piperazin-1-yl)ethan-1-ol: To a stirred solution of 5-bromo-2-nitropyridine (500 mg,2.47 mmol, 1 equiv) in DMSO (10 mL), was added K₂CO₃ (683 mg, 4.95 mmol,2 equiv) and 2-(piperazin-1-yl) ethan-1-ol (482 mg, 3.71 mmol, 1.5equiv). The resultant reaction mixture was allowed to stir at 100° C.for overnight. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, diluted with water (50 mL), solid observedwas filtered and dried under vacuum to obtain2-(4-(6-nitropyridin-3-yl)piperazin-1-yl)ethan-1-ol (300 mg, 48%) as ayellow solid compound. LCMS: 253 [M+H]⁺

Step-2: Synthesis of 2-(4-(6-aminopyridin-3-yl) piperazin-1-yl)ethan-1-ol: To a stirred solution of 2-(4-(6-nitropyridin-3-yl)piperazin-1-yl) ethan-1-ol (200 mg, 0.79 mmol, 1 equiv) in methanol (10mL), was added Pd/C (20% w/w) (40 mg). The resultant reaction mixturewas allowed to stir at RT for 1 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, the mixturewas passes through celite bed and the filtrate was concentrated underreduced pressure to obtain 2-(4-(6-aminopyridin-3-yl) piperazin-1-yl)ethan-1-ol (150 mg, 85%) as a white color solid compound. LCMS: 223[M+H]^(+Step-)3: Synthesis of2-(4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazin-1-yl)ethan-1-ol:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (3 mL), was added2-(4-(6-aminopyridin-3-yl)piperazin-1-yl)ethan-1-ol (73 mg, 0.33 mmol,1.1 equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified byrecrystallization with methanol to obtain2-(4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazin-1-yl)ethan-1-ol(30 mg, 19%) as a yellow color solid compound. LCMS: 512 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d₆) δ 9.69 (s, 1H), 8.56 (d, J=3.9 Hz, 1H), 7.93-8.09 (m,2H), 7.46 (br. s, 1H), 7.36 (d, J=2.6 Hz, 1H), 7.17 (d, J=11.8 Hz, 1H),4.44 (t, J=5.0 Hz, 1H), 4.30 (br. s, 2H), 4.05-4.20 (m, 1H), 3.47-3.61(m, 2H), 3.30 (s, 2H), 3.11 (br. s, 4H), 2.57 (br. s, 4H), 2.29-2.46 ppm(m, 2H), 1.18 (d, J=6.5 Hz, 6H).

Example-99 Synthesis of2-(1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-yl)ethan-1-ol.(Compound 491)

Step-1: Synthesis of 2-(1-(6-nitropyridin-3-yl) piperidin-4-yl)ethan-1-ol: To a stirred solution of 5-bromo-2-nitropyridine (500 mg,2.47 mmol, 1 equiv) in DMSO (10 mL), was added K₂CO₃ (683 mg, 4.95 mmol,2 equiv) and 2-(piperidin-4-yl) ethan-1-ol (449 mg, 3.71 mmol, 1.5equiv). The resultant reaction mixture was allowed to stir at 100° C.for overnight. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, diluted with water (50 mL), solid observedwas filtered and dried under vacuum to obtain2-(1-(6-nitropyridin-3-yl)piperidin-4-yl)ethan-1-ol (500 mg, 81%) as ayellow solid compound. LCMS: 252 [M+H]⁺

Step-2: Synthesis of 2-(1-(6-aminopyridin-3-yl) piperidin-4-yl)ethan-1-ol: To a stirred solution of 2-(1-(6-nitropyridin-3-yl)piperidin-4-yl) ethan-1-ol (200 mg, 0.79 mmol, 1 equiv) in methanol (10mL), was added Pd/C (20% w/w) (40 mg). The resultant reaction mixturewas allowed to stir at RT for 1 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, the mixturewas passes through celite bed and the filtrate was concentrated underreduced pressure to obtain 2-(1-(6-aminopyridin-3-yl) piperidin-4-yl)ethan-1-ol (150 mg, 85%) as a white color solid compound. LCMS: 222[M+H]⁺

Step-3: Synthesis of2-(1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-yl)ethan-1-ol:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (3 mL), was added2-(1-(6-aminopyridin-3-yl)piperidin-4-yl)ethan-1-ol (73 mg, 0.33 mmol,1.1 equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified byrecrystallization with methanol to obtain2-(1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-yl)ethan-1-ol(40 mg, 25%) as a yellow color solid compound. LCMS: 511 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d₆) δ 9.64 (s, 1H), 8.55 (d, J=3.9 Hz, 1H), 7.90-8.04 (m,2H), 7.47 (s, 1H), 7.37 (dd, J=9.0, 2.9 Hz, 1H), 7.17 (d, J=11.4 Hz,1H), 4.37 (br. s, 1H), 4.30 (br. s, 2H), 3.95-4.21 (m,1H), 3.60 (d,J=12.3 Hz, 2H), 3.48 (br. s, 2H), 3.30 (s, 2H), 2.56-2.71 (m, 2H), 1.75(d, J=11.8 Hz, 2H), 1.51 (br. s, 1H), 1.31-1.42 (m, 2H), 1.20-1.31 (m,2H), 1.18 ppm (s, 6H).

Example-100 Synthesis of1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)pyrrolidin-3-ol.(Compound 492)

Step-1: Synthesis of 1-(6-nitropyridin-3-yl)pyrrolidin-3-ol: To astirred solution of 5-bromo-2-nitropyridine (1000 mg, 4.9 mmol, 1 equiv)in ACN (10 mL), was added pyrrolidin-3-ol (640 mg, 7.4 mmol, 1.5 equiv)followed by addition of K₂CO₃ (1010 mg, 7.4 mmol, 1.5 equiv). Resultantmixture was allowed to stir at 80° for 12 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, themixture was diluted with water (15 mL), and was extracted with EtOAc (25mL). Organic layer dried over anhydrous sodium sulphate and concentratedunder reduced pressure to obtain crude compound was triturated fromhexane to afford 1-(6-nitropyridin-3-yl) pyrrolidin-3-ol (1000 mg) as ayellow solid compound. LCMS: 588 [M+H]⁺

Step-2: Synthesis 1-(6-aminopyridin-3-yl) pyrrolidin-3-ol: To a stirredsolution of 1-(6-nitropyridin-3-yl) pyrrolidin-3-ol (100 mg, 0.47 mmol,1 equiv) in methanol (8 mL), was added 10 wt. % Pd/C (20 mg). 2Lhydrogen balloon was pressurized over reaction. The resultant reactionmixture was allowed to stir at room temperature for 4 h. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, the mixture was filtered carefully through cealite bed.Filtrate was concentrated under reduced pressure to obtain1-(6-aminopyridin-3-yl) pyrrolidin-3-ol (85 mg, 82%) as a dark brownsolid compound. LCMS: 180 [M+H]⁺

Step-3: Synthesis of1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)pyrrolidin-3-ol:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(120 mg, 0.37 mmol, 1 equiv) in dioxane (3 mL), was added1-(6-aminopyridin-3-yl)pyrrolidin-3-ol (72 mg, 0.4 mmol, 1.2 equiv) andcesium carbonate (240 mg, 0.74 mmol, 2 equiv). The reaction mixture wasdegassed by nitrogen gas for 10 min, followed by the addition ofpalladium acetate (8 mg, 0.037 mmol, 0.1 equiv) and BINAP (46 mg, 0.074mmol, 0.2 equiv). The resultant reaction mixture was allowed to stir at100° C. for 16 h. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, diluted with water (10 mL) andextracted with ethyl acetate (10 mL). Organic layer was washed withwater (5 mL) and brine solution (5 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by reverse phase HPLC to obtain1-(64(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)pyrrolidin-3-ol(25 mg, 19%) as an off white solid compound. LCMS: 469 [M+H]³⁰ ; ¹HNMR(400 MHz, DMSO-d₆) δ ppm 1.19 (d, J=6.58 Hz, 4H) 1.91 (br. s, 2H) 2.06(br. s, 2H) 3.08 (d, J=9.65 Hz, 2H) 3.43 (br. s, 2H) 4.15 (br. s, 2H)4.30 (br. s, 1H) 4.41 (br. s, 1H) 4.97 (d, J=3.51 Hz, 1H) 6.96 (d,J=11.84 Hz, 1H) 7.48 (br. s, 1H) 7.65 (br. s, 1H) 7.93 (d, J=8.77 Hz,1H) 8.52 (d, J=3.95 Hz, 1H) 9.46 (s, 1H)

Example-101 Synthesis of1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-4-(hydroxymethyl)piperidin-4-ol.(Compound 493)

Step-1: Synthesis of 4-(hydroxymethyl)-1-(6-nitropyridin-3-yl)piperidin-4-ol: To a stirred solution of 5-bromo-2-nitropyridine (400mg, 1.98 mmol, 1 equiv) in DMSO (10 mL), was added K₂CO₃ (820 mg, 5.95mmol, 2 equiv) and 4-(hydroxymethyl) piperidin-4-ol (661 mg, 3.96 mmol,2 equiv). The resultant reaction mixture was allowed to stir at 100° C.for overnight. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, diluted with water (30 mL) and extractedwith ethyl acetate (100 mL). Organic layer was washed with water (50 mL)and brine solution (50 mL). Organic layer was dried over anhydroussodium sulphate and concentrated under reduced pressure to obtain4-(hydroxymethyl)-1-(6-nitropyridin-3-yl) piperidin-4-ol (200 mg, 40%)as a yellow solid compound. LCMS: 254 [M+H]⁺

Step-2: Synthesis of 1-(6-aminopyridin-3-yl)-4-(hydroxymethyl)piperidin-4-ol: To a stirred solution of4-(hydroxymethyl)-1-(6-nitropyridin-3-yl) piperidin-4-ol (200 mg, 0.79mmol, 1 equiv) in methanol (10 mL), was added Pd/C (20% w/w) (40 mg).The resultant reaction mixture was allowed to stir at RT for 1 h.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the mixture was passes through celite bed and thefiltrate was concentrated under reduced pressure to obtain1-(6-aminopyridin-3-yl)-4-(hydroxymethyl)piperidin-4-ol (120 mg, 68%) asa dark brown color viscous compound. LCMS: 224 [M+H]⁺

Step-3: Synthesis of1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-4-(hydroxymethyl)piperidin-4-ol:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (3 mL), was added1-(6-aminopyridin-3-yl)-4-(hydroxymethyl)piperidin-4-ol (74 mg, 0.33mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtain1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-4-(hydroxymethyl)piperidin-4-ol(8 mg, 5%) as a yellow color solid compound. LCMS: 513 [M+H]³⁰ ; ¹HNMR(400 MHz, DMSO-d₆) δ 9.62 (s, 1H), 8.55 (d, J=3.9 Hz, 1H), 7.83-8.04 (m,2H), 7.46 (s, 1H), 7.26-7.39 (m, 1H), 7.17 (d, J=11.4 Hz, 1H), 4.29 (d,J=3.9 Hz, 2H), 4.05-4.21 (m, 1H), 3.30 (s, 2H), 3.22 (br. s, 4H),2.91-3.12 (m, 2H), 1.59-1.76 (m, 2H), 1.44 (d, J=13.2 Hz, 2H), 1.18 ppm(d, J=6.6 Hz, 6H).

Example-102 Synthesis of1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-3-methylpyrrolidin-3-ol.(Compound 494)

Step-1: Synthesis of 3-methyl-1-(6-nitropyridin-3-yl) pyrrolidin-3-ol:To a stirred solution of 5-bromo-2-nitropyridine (500 mg, 2.47 mmol, 1equiv) in ACN (10 mL), was added K₂CO₃ (1023 mg, 7.41 mmol, 3 equiv) and3-methylpyrrolidin-3-ol (500 mg, 4.95 mmol, 2 equiv). The resultantreaction mixture was allowed to stir at 100° C. for overnight. Progressof the reaction was monitored by LCMS. After completion of the reaction,diluted with water (50 mL) and extracted with ethyl acetate (100 mL).Organic layer was washed with water (50 mL) and brine solution (50 mL).Organic layer was dried over anhydrous sodium sulphate and concentratedunder reduced pressure to obtain 3-methyl-1-(6-nitropyridin-3-yl)pyrrolidin-3-ol (500 mg, 91%) as a brown viscous compound. LCMS: 224[M+H]⁺

Step-2: Synthesis of 1-(6-aminopyridin-3-yl)-3-methylpyrrolidin-3-ol: Toa stirred solution of 3-methyl-1-(6-nitropyridin-3-yl)pyrrolidin-3-ol(200 mg, 0.89 mmol, 1 equiv) in methanol (10 mL), was added Pd/C (20%w/w) (40 mg). The resultant reaction mixture was allowed to stir at RTfor 1 h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the mixture was passes through celite bedand the filtrate was concentrated under reduced pressure to obtain1-(6-aminopyridin-3-yl)-3-methylpyrrolidin-3-ol (150 mg, 87%) as color adark brown solid compound. LCMS: 194 [M+H]⁺

Step-3: Synthesis of1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-3-methylpyrrolidin-3-ol:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (3 mL), was added1-(6-aminopyridin-3-yl)-3-methylpyrrolidin-3-ol (64 mg, 0.33 mmol, 1.1equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv). The reactionmixture was degassed with nitrogen gas for 30 min, followed by theaddition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP(8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtain1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-3-methylpyrrolidin-3-ol(25 mg, 17%) as a yellow color solid compound. LCMS: 483 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d₆) δ 9.45 (s, 1H), 8.52 (d, J=3.9 Hz, 1H), 7.92 (d,J=8.8 Hz, 1H), 7.62 (d, J=2.6 Hz, 1H), 7.47 (s, 1H), 7.16 (d, J=12.3 Hz,1H), 6.75-7.00 (m, 1H), 4.30 (br. s, 2H), 4.03-4.21 (m, 1H), 3.38 (d,J=7.9 Hz, 2H), 3.24-3.37 (m, 2H), 3.09-3.23 (m, 2H), 1.79-2.04 (m, 2H),1.36 (s, 3H), 1.19 ppm (d, J=6.6 Hz, 6H).

Example-103 Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-3-(1-methylpiperidin-4-yl)isoxazol-5-amine.(Compound 495)

Step-1: Synthesis of 1-(tert-butyl) 4-methylpiperidine-1,4-dicarboxylate: To a solution1-(tert-butoxycarbonyl)piperidine-4-carboxylic acid (2000 mg, 8.69 mmol,1 equiv) in DMF (25 mL), was methyl iodide (0.694m1 , 10.25 mmol) 1.2equiv) was added drop wise under nitrogen and potassium carbonate (1200mg, 8.69 mmol, 1 equiv). The resultant reaction mixture was allowed tostir at RT for 3 h. Progress of the reaction was monitored by NMR andTLC. After completion of the reaction, reaction mixture was diluted withwater (30 mL) and extracted with ethyl acetate (100 mL×2). Organic layerwas washed with water (100 mL). Organic layer was dried over anhydroussodium sulphate and concentrated under reduced pressure to obtaineddesired product 1-(tert-butyl) 4-methyl piperidine-1,4-dicarboxylate(1760 mg,) as a yellow oil compound. LCMS: ELSD 244 [M+H]⁺

Step-2: Synthesis of tert-butyl 4-(2-cyanoacetyl)piperidine-1-carboxylate: To a stirred solution of 1-(tert-butyl)4-methyl piperidine-1,4-dicarboxylate (500 mg, 2.04mmo1, 1 equiv) in THF(10 mL), was added methyl cyanide (0.56 mg, 5equiv.), andpotassium-terbutoxide(689 mg, 3equiv). The resultant reaction mixturewas allowed to stir at RT for 1 h. Progress of the reaction wasmonitored bylH NMR. After completion of the reaction, the mixture wasadded aquas ammonium chloride solution (60 mL) resulted solution wasdiluted with water (20 mL) and extracted with ethyl acetate (100 mL).Organic layer was washed with brine solution (50 mL). Organic layer wasdried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain crude, which was purified by normal phase combi flashto obtain of tert-butyl 4-(2-cyanoacetyl)piperidine-1-carboxylate as alight yellow oil compound. LCMS: ELSD 253 [M+H]⁺

Step-3: Synthesis of tert-butyl 4-(5-aminoisoxazol-3-yl)piperidine-1-carboxylate: To a solution of tert-butyl 4-(2-cyanoacetyl)piperidine-1-carboxylate (500 mg, 1.98 mmol, 1 equiv) in methanol (10mL) in sealed tube, was added hydroxylamine hydrochloride (275 mg, 3.96mmol, 2equiv), sodium acetate (324 mg, 3.96 mmol, 2equiv). The resultantreaction mixture was allowed to stir at RT for 20-24 h. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, diluted with water (30 mL) and extracted with ethyl acetate(100 mL). Organic layer was washed with water (20 mL) and brine solution(30 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude, which was purifiedby normal phase combi flash to obtain tert-butyl4-(5-aminoisoxazol-3-yl)piperidine-1-carboxylate (80 mg, 73%) as ayellow solid compound. LCMS: 267 [M+H]⁺

Step-4: Synthesis of tert-butyl4-(5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)isoxazol-3-yl)piperidine-1-carboxylate:To the solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) was added dioxane(6 ml) and tert-butyl4-(5-aminoisoxazol-3-yl)piperidine-1-carboxylate(90 mg ,0.33 mmol,1.1equiv), cesium carbonate(149 mg, 0.45 mmol, 1.5equiv), resultedreaction mixture was degassed with nitrogen for 5 min thereafter wasadded Pd(Oac)₂, (8 mg, 0.03 mmol, 0.1 equiv), BINAP(38 mg, 0.06 mmol,0.2 mmol),resulted reaction mixture was allowed to stir for 15 h at 100°C. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, the reaction mixture was diluted with water (25 mL) andextracted with ethyl acetate (50 mL×2). Organic layer was washed withwater (20 mL) and brine solution (25 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by combi-flash to obtain tert-butyl4-(5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)isoxazol-3-yl)piperidine-1-carboxylate(180 mg, 22%) as a yellow solid compound. LCMS: 556 [M+H]⁺

Step-5:N-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-3-(piperidin-4-yl)isoxazol-5-amine:tert-butyl4-(5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)isoxazol-3-yl)piperidine-1-carboxylate(200 mg, 0.179 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure and the residuewas dried under lyophilizer to obtainN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-3-(1-methylpiperidin-4-yl)isoxazol-5-amine(150 mg, 81%) as a brick red color solid compound. LCMS: 456 [M+H]⁺

Step-6: Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-3-(1-methylpiperidin-4-yl)isoxazol-5-amine:To a stirred solution ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-3-(1-methylpiperidin-4-yl)isoxazol-5-amine(50 mg, 0.109 mmol, 1 equiv) in DCE (3 mL), was added Formaldehyde (40%in water) (0.01 mL, 0.29 mmol, 3 equiv), acetic acid (0.02 mL, 0.45mmol, 5 equiv). The reaction mixture was allowed to stir at RT for 1 h.The reaction mixture was cooled to 0° C. NaCNBH₃ (18 mg, 0.29 mmol, 3equiv) was added to above mixture and raise the temperature to RT. Thereaction mixture was allowed to stir at RT for overnight. Progress ofthe reaction was monitored by LCMS. After completion of the reaction,the reaction mixture was diluted with water (25 mL) and extracted withethyl acetate (50 mL×2). Organic layer was washed with water (50 mL) andbrine solution (50 mL). Organic layer was dried over anhydrous sodiumsulphate and concentrated under reduced pressure to obtain crude, whichwas purified by reverse phase HPLC to affordN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-3-(1-methylpiperidin-4-yl)isoxazol-5-amine(7 mg, 61%) as a yellow color solid compound. LCMS: 471 [M+H]⁺; ¹H NMR(400 MHz, Methanol-d4) δ 8.48 (d, J=3.9 Hz, 1H), 7.48 (s, 1H), 7.29-7.21(m, 1H), 6.36 (d,J=3.4 Hz, 1H), 4.33 (t, J=4.3 Hz, 2H), 4.22 (p, J=6.7Hz, 1H), 3.35 (d, J=4.0 Hz, 5H), 3.15 (d, J=12.4 Hz, 3H), 2.83 (t,J=12.0 Hz, 1H), 2.54-2.46 (m, 5H), 2.08 (t, J=16.7 Hz, 3H), 1.90 (q,J=12.4 Hz, 2H), 1.29 (s, 1H), 1.26 (dd, J=6.6, 3.3 Hz, 6H).

Example-104 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(1-(1-methylpiperidin-4-yl)-1H-imidazol-4-yl)pyrimidin-2-amine.(Compound 496)

Step-1: Synthesis of tert-butyl 4-((methylsulfonyl) oxy)piperidine-1-carboxylate: To a stirred solution of tert-butyl4-hydroxypiperidine-1-carboxylate (5000 mg, 24.87 mmol, 1 equiv) in DCM(50 mL), was added TEA (5 mL, 34.8 mmol, 1.4 equiv). Cool the reactionmixture to 0° C, followed by the addition of mesyl chloride (2.5 mL,34.8 mmol, 1.4 equiv). Raise the temp. to RT and the resultant reactionmixture was allowed to stir for overnight. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, diluted with water(100 mL) and extracted with DCM (150 mL×2). Organic layer was washedwith water (100 mL) and brine solution (100 mL). Organic layer was driedover anhydrous sodium sulphate and concentrated under reduced pressureto obtain tert-butyl 4-((methylsulfonyl)oxy)piperidine-1-carboxylate(5000 mg, 72%) as an off white solid compound. LCMS: ELSD 280 [M+H]⁺

Step-2: Synthesis of tert-butyl 4-(4-nitro-1H-imidazol-1-yl)piperidine-1-carboxylate: To a stirred solution of tert-butyl4-((methylsulfonyl) oxy) piperidine-1-carboxylate (4000 mg, 14.3 mmol, 1equiv) in DMF (30 mL), was added Cs₂CO3 (9324 mg, 28.6 mmol, 2 equiv),TBAI (1055 mg, 2.86 mmol, 0.2 equiv) and 4-nitro-1H-imidazole (810 mg,7.16 mmol, 0.5 equiv). The resultant reaction mixture was allowed tostir at 80° C. for overnight. Progress of the reaction was monitored byLCMS. After completion of the reaction, diluted with water (100 mL) andextracted with EtOAc (150 mL×2). Organic layer was washed with water(100 mL) and brine solution (100 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by normal phase Combi flash to obtaintert-butyl 4-(4-nitro-1H-imidazol-1-yl)piperidine-1-carboxylate (550 mg,13%) as an off white solid compound. LCMS: 297 [M+H]⁺

Step-3: Synthesis of tert-butyl 4-(4-amino-1H-imidazol-1-yl)piperidine-1-carboxylate: To a stirred solution of tert-butyl4-(4-nitro-1H-imidazol-1-yl) piperidine-1-carboxylate (550 mg, 1.85mmol, 1 equiv) in methanol (10 mL), was added Pd/C (20% w/w) (110 mg).The resultant reaction mixture was allowed to stir at RT for 1 h.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the mixture was passes through celite bed and thefiltrate was concentrated under reduced pressure to obtain tert-butyl4-(4-amino-1H-imidazol-1-yl) piperidine-1-carboxylate (450 mg, 91%) as abrown color viscous compound. LCMS: 267 [M+H]⁺

Step-4: Synthesis of tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1H-imidazol-1-yl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(500 mg, 1.53 mmol, 1 equiv) in dioxane (5 mL), was added tert-butyl4-(4-amino-1H-imidazol-1-yl)piperidine-1-carboxylate (450 mg, 1.69 mmol,1.1 equiv) and cesium carbonate (748 mg, 2.29 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (7 mg, 0.03 mmol, 0.02 equiv) andBINAP (38 mg, 0.06 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to obtain tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1H-imidazol-1-yl)piperidine-1-carboxylate(600 mg, 70%) as a brown color viscous compound. LCMS: 556 [M+H]⁺

Step-5: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(1-(piperidin-4-yl)-1H-imidazol-4-yl)pyrimidin-2-amine:tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1H-imidazol-1-yl)piperidine-1-carboxylate(600 mg, 1.08 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (10 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure to obtain crudecompound, which was purified by making HCl salt to afford 5-fluoro-45-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(1-(piperidin-4-yl)-1H-imidazol-4-yl)pyrimidin-2-amine(400 mg, 81%) as an orange color solid compound. LCMS: 456 [M+H]⁺

Step-6: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(1-(1-methylpiperidin-4-yl)-1H-imidazol-4-yl)pyrimidin-2-amine:To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(1-(piperidin-4-yl)-1H-imidazol-4-yl)pyrimidin-2-amine(50 mg, 0.1 mmol, 1 equiv) in DCE (5 mL), was added Formaldehyde (40% inwater) (0.01 mL, 0.3 mmol, 3 equiv), acetic acid (0.03 mL, 0.5 mmol, 5equiv). The reaction mixture was allowed to stir at RT for 1 h. Thereaction mixture was cooled to 0° C. NaCNBH₃ (19 mg, 0.3 mmol, 3 equiv)was added to above mixture and raise the temperature to RT. The reactionmixture was allowed to stir at RT for 1 h. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, the reactionmixture was diluted with water (25 mL) and extracted with ethyl acetate(50 mL×2). Organic layer was washed with water (50 mL) and brinesolution (50 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by reverse phase HPLC to afford5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(1-(1-methylpiperidin-4-yl)-1H-imidazol-4-yl)pyrimidin-2-amine(6 mg, 13%) as a yellow color solid compound. LCMS: 470 [M+H]³⁰ ; ¹HNMR(400 MHz, DMSO-d₆) δ 9.68 (br. s, 1H), 8.50 (br. s, 1H), 7.56 (br. s,1H), 7.39 (br. s, 1H), 7.32 (br. s, 1H), 7.17 (s, 1H), 4.30 (br. s, 2H),4.13 (d, J=7.8 Hz, 1H), 3.31 (br. s, 2H), 3.08 (br. s, 2H), 2.90 (d,J=7.3 Hz, 2H), 2.08 (br. s, 3H), 2.00 (br. s, 2H), 1.97 (br. s, 2H),1.01-1.29 ppm (m, 7H).

Example-105 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(1-(1-methylpiperidin-4-yl)-1H-pyrazol-4-yl)pyrimidin-2-amine.(Compound 497)

Step-1: Synthesis of tert-butyl 4-((methylsulfonyl) oxy)piperidine-1-carboxylate: To a stirred solution of tert-butyl4-hydroxypiperidine-1-carboxylate (1000 mg, 4.97 mmol, 1 equiv) in DCM(15 mL), was added TEA (1 mL, 6.96 mmol, 1.4 equiv). Cool the reactionmixture to 0° C, followed by the addition of mesyl chloride (0.5 mL,6.96 mmol, 1.4 equiv). Raise the temp. to RT and the resultant reactionmixture was allowed to stir for overnight. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, diluted with water(50 mL) and extracted with DCM (100 mL×2). Organic layer was washed withwater (100 mL) and brine solution (100 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain tert-butyl 4-((methylsulfonyl)oxy)piperidine-1-carboxylate (1200mg, 86%) as an off white solid compound.

Step-2: Synthesis of tert-butyl 4-(4-nitro-1H-pyrazol-1-yl)piperidine-1-carboxylate: To a stirred solution of tert-butyl4-hydroxypiperidine-1-carboxylate (500 mg, 1.79 mmol, 1 equiv) in DMF(10 mL), was added Cs₂CO₃ (1167 mg, 3.58 mmol, 2 equiv), TBAI (133 mg,0.36 mmol, 0.2 equiv) and 4-nitro-1H-pyrazole (101 mg, 0.89 mmol, 0.5equiv). The resultant reaction mixture was allowed to stir at 80° C. forovernight. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, diluted with water (50 mL) and extractedwith EtOAc (100 mL×2). Organic layer was washed with water (100 mL) andbrine solution (100 mL). Organic layer was dried over anhydrous sodiumsulphate and concentrated under reduced pressure to obtain crude, whichwas purified by normal phase Combi flash to obtain tert-butyl4-(4-nitro-1H-pyrazol-1-yl)piperidine-1-carboxylate (400 mg, 75%) as abrown viscous compound. LCMS: 297 [M+H]⁺

Step-3: Synthesis of tert-butyl 4-(4-amino-1H-pyrazol-1-yl)piperidine-1-carboxylate: To a stirred solution of tert-butyl4-(4-nitro-1H-pyrazol-1-yl) piperidine-1-carboxylate (200 mg, 0.67 mmol,1 equiv) in methanol (10 mL), was added Pd/C (20% w/w) (40 mg). Theresultant reaction mixture was allowed to stir at RT for 1 h. Progressof the reaction was monitored by TLC and LCMS. After completion of thereaction, the mixture was passes through celite bed and the filtrate wasconcentrated under reduced pressure to obtain tert-butyl4-(4-amino-1H-pyrazol-1-yl) piperidine-1-carboxylate (150 mg, 83%) as abrown color viscous compound. LCMS: 267 [M+H]⁺

Step-4: Synthesis of tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1H-pyrazol-1-yl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (5 mL), was added tert-butyl4-(4-amino-1H-pyrazol-1-yl)piperidine-1-carboxylate (90 mg, 0.33 mmol,1.1 equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified byrecrystallization with methanol to obtain tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1H-pyrazol-1-yl)piperidine-1-carboxylate(150 mg, 88%) as a yellow color solid compound. LCMS: 556 [M+H]⁺

Step-5: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(1-(piperidin-4-yl)-1H-pyrazol-4-yl)pyrimidin-2-amine:tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1H-pyrazol-1-yl)piperidine-1-carboxylate(150 mg, 0.27 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure and the residuewas dried under lyophilizer to obtain crude compound, which was purifiedby making HCl salt to afford5-fluoro-4-(8-fluoro-4-isopropl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(1-(piperidin-4-yl)-1H-pyrazol-4-yl)pyrimidin-2-amine(100 mg, 81%) as an orange color solid compound. LCMS: 456 [M+H]⁺

Step-6: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(1-(1-methylpiperidin-4-yl)-1H-pyrazol-4-yl)pyrimidin-2-amine:To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(1-(piperidin-4-yl)-1H-pyrazol-4-yl)pyrimidin-2-amine(100 mg, 0.2 mmol, 1 equiv) in DCE (5 mL), was added Formaldehyde (40%in water) (0.03 mL, 0.6 mmol, 3 equiv), acetic acid (0.05 mL, 1.0 mmol,5 equiv). The reaction mixture was allowed to stir at RT for 1 h. Thereaction mixture was cooled to 0° C. NaCNBH₃ (38 mg, 0.6 mmol, 3 equiv)was added to above mixture and raise the temperature to RT. The reactionmixture was allowed to stir at RT for 1 h. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, the reactionmixture was diluted with water (25 mL) and extracted with ethyl acetate(50 mL×2). Organic layer was washed with water (50 mL) and brinesolution (50 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by reverse phase HPLC to afford5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(1-(1-methylpiperidin-4-yl)-1H-pyrazol-4-yl)pyrimidin-2-amine(10 mg, 10%) as a yellow color solid compound. LCMS: 470 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d₆) δ 9.48 (s, 1H), 8.48 (d, J=3.9 Hz, 1H), 7.90 (s, 1H),7.56 (br. s, 1H), 7.35 (s, 1H), 7.13 (d, J=11.8 Hz, 1H), 4.29 (br. s,2H), 3.98-4.17 (m, 2H), 3.30 (br. s, 2H), 2.85 (d, J=11.4 Hz, 2H), 2.20(s, 3H), 1.98-2.11 (m, 2H), 1.69-1.98 (m, 4H), 1.18 ppm (d, J=6.6 Hz,6H).

Example-106 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(1-methylpyrrolidin-3-yl)pyridin-2-yl)pyrimidin-2-amine.(Compound 498)

Step-1: Synthesis of tert-butyl3-(6-nitropyridin-3-yl)-2,5-dihydro-1H-pyrrole-1-carboxylate: To astirred solution of 6-bromo-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one(700 mg, 2.85 mmol, 1 equiv) in DMF (10 mL), was added K₂CO₃ (789 mg,5.71 mmol, 2 equiv) and ethyl iodide (0.5 mL, 5.71 mmol, 2 equiv). Thereaction mixture was allowed to stir at 80° C. for 3 h. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, the reaction mixture was diluted with water (50 mL), solidobserved was filtered dried under vacuum to obtain6-bromo-4-ethyl-8-fluoro-2H-benzo[b][1,4]oxazin-3(4H)-one (700 mg, 90%)as an off white solid compound. LCMS: 274 [M+H]⁺

Step-2: Synthesis of tert-butyl 3-(6-aminopyridin-3-yl)pyrrolidine-1-carboxylate: To a stirred solution of tert-butyl3-(6-nitropyridin-3-yl)-2,5-dihydro-1H-pyrrole-1-carboxylate (100 mg,0.3 mmol, equiv) in ethanol (3 mL), was added PdC (20 mg,0.2 mmol, 1equiv) The resultant reaction mixture was allowed to stir at RT for 3 h.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the mixture was passes through celite bed and thefiltrate was concentrated under reduced pressure to obtain tert-butyl3-(6-aminopyridin-3-yl) pyrrolidine-1-carboxylate (90 mg, 91%) as abrown Solid compound. LCMS: 264 [M+H] +

Step-3: Synthesis of tert-butyl3-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)pyrrolidine-1-carboxylate:To the solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(150 mg, 0.46 mmol, 1 equiv) was added dioxane (5 ml) and tert-butyl3-(6-aminopyridin-3-yl)pyrrolidine-1-carboxylate (145 mg ,0 0.50mmo1,1.1equiv), cesium carbonate(224 mg, 0.69mmo1, 1.5equiv), resultedreaction mixture was degassed with nitrogen for 5 min thereafter wasadded Pd(Oac)₂, (11 mg, 0.046 mmol, 0.lequiv), BINAP (57 mg, 0.09 mmol,0.2 mmol),resulted reaction mixture was allowed to stir for 15 h at 100°C. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, the reaction mixture was diluted with water (25 mL) andextracted with ethyl acetate (40 mL×2). Organic layer was washed withwater (35 mL) and brine solution (25 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by combi-flash to get tert-butyl3-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)pyrrolidine-1-carboxylate(190 mg,16%) as a yellow solid compound. LCMS: 553 [M+H]⁺

Step-4: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(pyrrolidin-3-yl)pyridin-2-yl)pyrimidin-2-amine:To the solution tert-butyl3-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)pyrrolidine-1-carboxylate(190 mg, 0.44 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 3h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure and the residuewas dried under lyophilizer to get5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(pyrrolidin-3-yl)pyridin-2-yl)pyrimidin-2-amine(99 mg, 39%) as a brick red color solid compound. LCMS: 453 [M+H]⁺

Step-5: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(1-methylpyrrolidin-3-yl)pyridin-2-yl)pyrimidin-2-amine:To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(pyrrolidin-3-yl)pyridin-2-yl)pyrimidin-2-amine(99 mg, 0.44mmo1, 1 equiv) in DCE (5 mL), was added Formaldehyde (40% inwater) (0.66 mL, 0.19 mmol, 3 equiv), acetic acid (0.2 mL, 1.1mmol, 5equiv). The reaction mixture was allowed to stir at RT for 1 h. Thereaction mixture was cooled to 0° C. NaCNBH₃ (41 mg, 0.66 mmol, 3 equiv)was added to above mixture and raise the temperature to RT. The reactionmixture was allowed to stir at RT for 4 h. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, the reactionmixture was diluted with water (20 mL) and extracted with ethyl acetate(25 mL×2). Organic layer was washed with water (15 mL) and brinesolution (20 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by reverse phase HPLC to afford5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(1-methylpyrrolidin-3-yl)pyridin-2-yl)pyrimidin-2-amine(18 mg, 99%) as a yellow color solid compound. LCMS: 471[M+H]³⁰ ; ¹HNMR(400 MHz, Methanol-d4) δ 8.44 (d, J=4.1 Hz, 1H), 8.30 (d, J=8.8 Hz, 1H),8.18 (s, 1H),7.79-7.71 (m, 1H), 7.52 (s, 1H), 7.29-7.21 (m, 1H), 4.33(t, J=4.3 Hz, 2H), 4.22 (p, J=6.6 Hz, 1H),3.57-3.44 (m, 1H), 3.35 (t,J=4.4 Hz, 4H), 3.14-3.03 (m, 1H), 3.03-2.93 (m, 1H), 2.77 (t, J=9.5Hz1H), 2.61 (s, 3H), 2.43 (dq, J=14.3, 8.2 Hz, 1H), 2.02 (dt, J=13.3,7.6 Hz, 1H), 1.26 (d, J=6.6 Hz,7H).

Example-107 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(3-(1-methylpiperidin-4-yl)-1H-pyrazol-5-yl)pyrimidin-2-amine.(Compound 499)

Step-1: Synthesis of tert-butyl 4-(5-amino-1H-pyrazol-3-yl)piperidine-1-carboxylate: To a solution of tert-butyl 4-(2-cyanoacetyl)piperidine-1-carboxylate (100 mg, 0.4 mmol, 1 equiv) in ethanol (4 mL)in sealed tube, was added hydrazine hydrate (0.12 mL, 2.4 mmol, 6equiv).The resultant reaction mixture was allowed to stir at 80° C. for 4 h.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (20 mL) and brinesolution (30 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by normal phase combi flash to obtain tert-butyl4-(5-amino-1H-pyrazol-3-yl)piperidine-1-carboxylate (80 mg, 73%) as ayellow solid compound. LCMS: 267 [M+H]⁺

Step-2: Synthesis of tert-butyl4-(5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1H-pyrazol-3-yl)piperidine-1-carboxylate:To the solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(150 mg, 0.46 mmol, 1 equiv) was added dioxane(5 ml) and tert-butyl4-(5-amino-1H-pyrazol-3-yl)piperidine-1-carboxylate (145 mg ,0 0.50mmol, 1.1equiv), cesium carbonate(223 mg, 0.69 mmol, 1.5equiv), resultedreaction mixture was degassed with nitrogen for 5 min thereafter wasadded Pd(Oac)₂, (10 mg, 0.046 mmol, 0.lequiv), BINAP (57 mg, 0.09 mmol,0.2 mmol),resulted reaction mixture was allowed to stir for 15 h at 100°C. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, the reaction mixture was diluted with water (25 mL) andextracted with ethyl acetate (50 mL×2). Organic layer was washed withwater (30 mL) and brine solution (20 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by combi-flash totert-butyl4-(5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1H-pyrazol-3-yl)piperidine-1-carboxylate(180 mg,46%) as a yellow solid compound. LCMS: 556 [M+H]⁺

Step-3:5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(3-(piperidin-4-yl)-1H-pyrazol-5-yl)pyrimidin-2-amine:tert-butyl4-(5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1H-pyrazol-3-yl)piperidine-1-carboxylate(250 mg, 0.44 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure and the residuewas dried under lyophilizer5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(3-(piperidin-4-yl)-1H-pyrazol-5-yl)pyrimidin-2-amine(200 mg, 44%) as a brick red color solid compound. LCMS: 456 [M+H]⁺

Step-4: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(3-(1-methylpiperidin-4-yl)-1H-pyrazol-5-yl)pyrimidin-2-amine:To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(3-(piperidin-4-yl)-1H-pyrazol-5-yl)pyrimidin-2-amine(200 mg, 0.44 mmol, 1 equiv) in DCE (35 mL), was added Formaldehyde (40%in water) (0.3 mL, 0.19 mmol, 3 equiv), acetic acid (0.013 mL, 2.1 mmol,5 equiv). The reaction mixture was allowed to stir at RT for 1 h. Thereaction mixture was cooled to 0° C. NaCNBH₃ (79 mg, 1.29 mmol, 3 equiv)was added to above mixture and raise the temperature to RT. The reactionmixture was allowed to stir at RT for 4 h. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, the reactionmixture was diluted with water (30 mL) and extracted with ethyl acetate(40 mL×2). Organic layer was washed with water (30 mL) and brinesolution (30 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by reverse phase HPLC to afford5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(3-(1-methylpiperidin-4-yl)-1H-pyrazol-5-yl)pyrimidin-2-amine.(14 mg, 93%) as a yellow color solid compound. LCMS: 470 [M+H]⁺; ¹HNMR(400 MHz, Methanol-d4) δ 8.48 (d, J=3.9 Hz, 1H), 7.48 (s, 1H), 7.29-7.21(m, 1H), 6.36 (d,J=3.4 Hz, 1H), 4.33 (t, J=4.3 Hz, 2H), 4.22 (p, J=6.7Hz, 1H), 3.35 (d, J=4.0 Hz, 5H), 3.15 (d, J=12.4 Hz, 3H), 2.83 (t,J=12.0 Hz, 1H), 2.54-2.46 (m, 5H), 2.08 (t, J=16.7 Hz, 3H), 1.90 (q,J=12.4 Hz, 2H), 1.29 (s, 1H), 1.26 (dd, J=6.6, 3.3 Hz, 6H).

Example-108 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperidin-4-yl)pyrimidin-2-yl)pyrimidin-2-amine.(Compound 500)

Step-1: Synthesis of tert-butyl 4-(2-aminopyrimidin-5-yl)-3,6-dihydropyridine-1(2H)-carboxylate: To a solution of5-bromopyrimidin-2-amine (1000 mg, 5.7 mmol, 1 equiv) in dioxane (12mL), water (2 mL) was added tert-butyl4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydropyridine-1(2H)-carboxylate(2143 mg, 6.93 mmol, 1.2 equiv) and potassium carbonate (2360 mg, 17.1mmol, 3 equiv). The reaction mixture was degassed with nitrogen gas for30 min, followed by the addition of Pd (dppf) Cl2.DCM (233 mg, 0.28mmol, 0.05 equiv). The resultant reaction mixture was allowed to stir at100° C. for overnight. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, reaction mixture was dilutedwith water (50 mL) and extracted with ethyl acetate (100 mL×2). Organiclayer was washed with water (100 mL) and brine solution (100 mL).Organic layer was dried over anhydrous sodium sulphate and concentratedunder reduced pressure to obtain crude, which was purified by normalphase combi flash to tert-butyl4-(2-aminopyrimidin-5-yl)-3,6-dihydropyridine-1(2H)-carboxylate (1000mg, 63%) as a brown solid compound. LCMS: 277 [M+H]⁺

Step-2: Synthesis of tert-butyl 4-(2-aminopyrimidin-5-yl)piperidine-1-carboxylate: To a stirred solution of tert-butyl4-(2-aminopyrimidin-5-yl)-3, 6-dihydropyridine-1(2H)-carboxylate (400mg, 0.72 mmol, 1 equiv) in ethanol (5 mL), was added Pd/C (20% w/w) (85mg) under H₂ atm. The resultant reaction mixture was allowed to stir atRT for 4 h. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, the mixture was passes through celite bedand the filtrate was concentrated under reduced pressure to obtaintert-butyl 4-(2-aminopyrimidin-5-yl) piperidine-1-carboxylate (360 mg,90%) as an off white color solid compound. LCMS: 279 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(2-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyrimidin-5-yl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(200 mg, 0.61 mmol, 1 equiv) in dioxane (5 mL), was added tert-butyl4-(2-aminopyrimidin-5-yl)piperidine-1-carboxylate (188 mg, 0.67 mmol,1.1 equiv) and cesium carbonate (298 mg, 0.91 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (3 mg, 0.01 mmol, 0.02 equiv) andBINAP (15 mg, 0.02 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to obtain tert-butyl4-(2-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyrimidin-5-yl)piperidine-1-carboxylate(150 mg, 43%) as a yellow solid compound. LCMS: 568 [M+H]⁺

Step-4: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperidin-4-yl)pyrimidin-2-yl)pyrimidin-2-amine:A solution of tert-butyl4-(2-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyrimidin-5-yl)piperidine-1-carboxylate(150 mg, 0.26 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperidin-4-yl)pyrimidin-2-yl)pyrimidin-2-amine(25 mg, 20%) as a yellow color solid compound. LCMS: 468 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d₆) δ 10.35 (s, 1H), 8.63 (d, J=3.9 Hz, 1H), 8.48 (s,2H), 7.57 (s, 1H), 7.21 (d, J=11.7 Hz, 1H), 4.29 (br. s, 2H), 3.99-4.16(m, 1H), 3.30 (br. s, 2H), 3.18 (d, J=9.3 Hz, 2H), 2.56-2.84 (m, 3H),1.84 (d, J=12.2 Hz, 2H), 1.66 (d, J=12.7 Hz, 2H), 1.19 ppm (d, J=6.8 Hz,6H).

Example-109 Synthesis of N-(5-(1-ethylpiperidin-4-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine.(Compound 501)

Step-1: Synthesis of N-(5-(1-ethylpiperidin-4-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine(80 mg, 0.16 mmol, 1 equiv) in DCE (5 mL), was added Acetaldehyde (0.01mL, 0.48 mmol, 3 equiv), acetic acid (0.04 mL, 0.8 mmol, 5 equiv). Thereaction mixture was allowed to stir at RT for 1 h. The reaction mixturewas cooled to 0° C. NaCNBH₃ (18 mg, 0.48 mmol, 3 equiv) was added toabove mixture and raise the temperature to room temperature. Thereaction mixture was allowed to stir at RT for 1 h. Progress of thereaction was monitored by LCMS. After completion of the reaction, thereaction mixture was diluted with water (25 mL) and extracted with ethylacetate (50 mL×2). Organic layer was washed with water (50 mL) and brinesolution (50 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by recrystallization with methanol to affordN-(5-(1-ethylpiperidin-4-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(70 mg, 82%) as a yellow color solid compound. LCMS: 495 [M+H]³⁰ ; ¹HNMR(400 MHz, DMSO-d₆) δ 9.89 (s, 1H), 8.60 (d, J=3.9 Hz, 1H), 8.18 (s, 1H),8.11 (d, J=8.8 Hz, 1H), 7.62 (d, J=8.8 Hz, 1H), 7.48 (s, 1H), 7.18 (d,J=11.4 Hz, 1H), 4.30 (br. s, 2H), 4.02-4.21 (m, 1H), 3.30 (br. s, 2H)2.98 (d, J=10.1 Hz, 2H), 2.35 (br. s, 2H), 1.97 (br. s, 3H), 1.76 (d,J=10.5 Hz, 2H), 1.65 (d, J=9.2 Hz, 2H), 1.19 (d, J=6.6 Hz, 6H), 1.02 ppm(t, J=7.2 Hz, 3H).

Example-110 Synthesis of74(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinolin-1(2H)-one.(Compound502)

To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (5 mL), was added7-amino-3,4-dihydroisoquinolin-1(2H)-one (54 mg, 0.33 mmol, 1.1 equiv)and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv). The reactionmixture was degassed with nitrogen gas for 30 min, followed by theaddition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP(8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for 3 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to afford7-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3,4-dihydroisoquinolin-1(2H)-one(5 mg, 4%) as a yellow color solid compound. LCMS: 452 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d₆) δ 9.76 (s, 1H), 8.57 (d, J=3.9 Hz, 1H), 8.25 (d,J=2.2 Hz, 1H), 7.89 (br. s, 1H), 7.81 (dd, J=8.3, 2.6 Hz, 1H), 7.41 (s,1H), 7.12-7.25 (m, 1H), 4.23-4.32 (m, 2H), 4.05-4.21 (m, 1H), 3.30-3.39(br. s, 4H), 2.85 (t, J=6.4 Hz, 2H), 1.16 (d, J=6.6 Hz, 6H).

Example-111 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-methyl-5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine.(Compound 503)

Step-1: Synthesis of tert-butyl 6-amino-2-methyl-3′,6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate: To a solution of5-bromopyrimidin-2-amine (1000 mg, 5.37 mmol, 1 equiv) in dioxane (12mL), water (2 mL) was added tert-butyl4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydropyridine-1(2H)-carboxylate(1994 mg, 6.45 mmol, 1.2 equiv) and potassium carbonate (1482 mg, 17.1mmol, 2 equiv). The reaction mixture was degassed with nitrogen gas for30 min, followed by the addition of Pd (dppf) Cl2 .DCM (219 mg, 0.26mmol, 0.05 equiv). The resultant reaction mixture was allowed to stir at100° C. for overnight. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, reaction mixture was dilutedwith water (50 mL) and extracted with ethyl acetate (100 mL×2). Organiclayer was washed with water (100 mL) and brine solution (100 mL).Organic layer was dried over anhydrous sodium sulphate and concentratedunder reduced pressure to obtain crude, which was purified by normalphase combi flash to obtain tert-butyl 6-amino-2-methyl-3′,6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate (1300 mg, 84%) as anoff white color solid compound. LCMS: 277 [M+H]⁺

Step-2: Synthesis of tert-butyl 4-(6-amino-2-methylpyridin-3-yl)piperidine-1-carboxylate: To a stirred solution of tert-butyl6-amino-2-methyl-3′, 6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate(400 mg, 1.38 mmol, 1 equiv) in ethanol (5 mL), was added Pd/C (20% w/w)(40 mg) under H₂ atm. The resultant reaction mixture was allowed to stirat RT for 4 h. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, the mixture was passes through celite bedand the filtrate was concentrated under reduced pressure to obtaintert-butyl 4-(6-amino-2-methylpyridin-3-yl) piperidine-1-carboxylate(380 mg, 94%) as an off white color solid compound. LCMS: 292 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-methylpyridin-3-yl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(6-amino-2-methylpyridin-3-yl)piperidine-1-carboxylate (96 mg, 0.33mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to obtain tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-methylpyridin-3-yl)piperidine-1-carboxylate(120 mg, 67%) as a yellow solid compound. LCMS: 581 [M+H]⁺

Step-4: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-methyl-5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine:A solution of tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-methylpyridin-3-yl)piperidine-1-carboxylate(120 mg, 0.22 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-methyl-5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine(100 mg, quantitative yield) as a yellow color solid compound. LCMS: 481[M+H]⁺

Step-5: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-methyl-5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine:To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-methyl-5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine(60 mg, 0.12 mmol, 1 equiv) in DCE (5 mL), was added Formaldehyde (40%in water) (0.01 mL, 0.37 mmol, 3 equiv), acetic acid (0.03 mL, 0.6 mmol,5 equiv). The reaction mixture was allowed to stir at RT for 1 h. Thereaction mixture was cooled to 0° C. NaCNBH₃ (23 mg, 0.37 mmol, 3 equiv)was added to above mixture and raise the temperature to RT. The reactionmixture was allowed to stir at RT for 1 h. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, the reactionmixture was diluted with water (25 mL) and extracted with ethyl acetate(50 mL×2). Organic layer was washed with water (50 mL) and brinesolution (50 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by recrystallization with methanol to afford5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-methyl-5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine(20 mg, 32%) as a yellow color solid compound. LCMS: 495 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d₆) δ 9.74 (s, 1H), 8.58 (d, J=3.9 Hz, 1H), 8.00 (d,J=8.3 Hz, 1H), 7.41-7.61 (m, 1H), 7.19 (d, J=11.7 Hz, 1H), 4.30 (br. s,2H), 4.02-4.22 (m, 1H), 3.31 (br. s, 2H), 2.88 (d, J=11.2 Hz, 2H), 2.59(d, J=11.2 Hz, 2H), 2.44 (s, 3H), 2.20 (s, 3H), 1.99 (t, J=10.3 Hz, 2H),1.46-1.75 (m, 3H), 1.19 ppm (d, J=6.4 Hz, 6H).

Example-112 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(1-(piperidin-4-yl)-1H-imidazol-4-yl)pyrimidin-2-amine.(Compound 504)

Step-1: Synthesis of tert-butyl 4-((methylsulfonyl) oxy)piperidine-1-carboxylate: To a stirred solution of4-hydroxycyclohexan-1-one (5000 mg, 24.87 mmol, 1 equiv) in DCM (50 mL),was added TEA (5 mL, 34.8 mmol, 1.4 equiv). Cool the reaction mixture to0° C, followed by the addition of mesyl chloride (2.5 mL, 34.8 mmol, 1.4equiv). Raise the temp. to RT and the resultant reaction mixture wasallowed to stir for overnight. Progress of the reaction was monitored byLCMS. After completion of the reaction, diluted with water (100 mL) andextracted with DCM (150 mL×2). Organic layer was washed with water (100mL) and brine solution (100 mL). Organic layer was dried over anhydroussodium sulphate and concentrated under reduced pressure to obtaintert-butyl 4-((methylsulfonyl) oxy) piperidine-1-carboxylate (5000 mg,72%) as an off white solid compound.

Step-2: Synthesis of tert-butyl 4-(4-nitro-1H-imidazol-1-yl)piperidine-1-carboxylate: To a stirred solution of tert-butyl4-((methylsulfonyl) oxy) piperidine-1-carboxylate (4000 mg, 14.3 mmol, 1equiv) in DMF (30 mL), was added Cs₂CO₃ (9324 mg, 28.6 mmol, 2 equiv),TBAI (1055 mg, 2.86 mmol, 0.2 equiv) and 4-nitro-1H-imidazole (810 mg,7.16 mmol, 0.5 equiv). The resultant reaction mixture was allowed tostir at 80° C. for overnight. Progress of the reaction was monitored byLCMS. After completion of the reaction, diluted with water (100 mL) andextracted with EtOAc (150 mL×2). Organic layer was washed with water(100 mL) and brine solution (100 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by normal phase Combi flash to obtaintert-butyl 4-(4-nitro-1H-imidazol-1-yl)piperidine-1-carboxylate (550 mg,13%) as an off white solid compound. LCMS: 297 [M+H]⁺

Step-3: Synthesis of tert-butyl 4-(4-amino-1H-imidazol-1-yl)piperidine-1-carboxylate: To a stirred solution of tert-butyl4-(4-nitro-1H-imidazol-1-yl) piperidine-1-carboxylate (550 mg, 1.85mmol, 1 equiv) in methanol (10 mL), was added Pd/C (20% w/w) (110 mg).The resultant reaction mixture was allowed to stir at RT for 1 h.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the mixture was passes through celite bed and thefiltrate was concentrated under reduced pressure to obtain tert-butyl4-(4-amino-1H-imidazol-1-yl) piperidine-1-carboxylate (450 mg, 91%) as abrown color viscous compound. LCMS: 267 [M+H]⁺

Step-4: Synthesis of tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1H-imidazol-1-yl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(500 mg, 1.53 mmol, 1 equiv) in dioxane (5 mL), was added tert-butyl4-(4-amino-1H-imidazol-1-yl)piperidine-1-carboxylate (450 mg, 1.69 mmol,1.1 equiv) and cesium carbonate (748 mg, 2.29 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (7 mg, 0.03 mmol, 0.02 equiv) andBINAP (38 mg, 0.06 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to obtain tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1H-imidazol-1-yl)piperidine-1-carboxylate(600 mg, 70%) as a brown color viscous compound. LCMS: 556 [M+H]⁺

Step-5: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(1-(piperidin-4-yl)-1H-imidazol-4-yl)pyrimidin-2-amine:tert-butyl4-(4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-1H-imidazol-1-yl)piperidine-1-carboxylate(100 mg, 0.18 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (10 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure to obtain crudecompound, which was purified by making HCl salt to afford 5-fluoro-45-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(1-(piperidin-4-yl)-1H-imidazol-4-yl)pyrimidin-2-amine(15 mg, 18%) as a yellow color solid compound. LCMS: 456 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d₆) δ 9.65 (br. s, 1H), 8.50 (br. s, 1H), 7.53 (br. s,1H), 7.39 (br. s, 1H), 7.31 (br. s, 1H), 7.15 (d, J=11.2 Hz, 1H), 4.30(br. s, 2H), 3.92-4.19 (m, 1H), 3.31 (br. s, 2H), 3.10 (d, J=10.3 Hz,2H), 2.65 (d, J=11.7 Hz, 2H), 1.97 (br. s, 2H), 1.76 (d, J=10.3 Hz, 2H),1.18 ppm (d, J=6.4 Hz, 6H).

Example-113 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperidin-4-yl)pyrazin-2-yl)pyrimidin-2-amine.(Compound 505)

Step-1; Synthesis of tert-butyl4-(5-aminopyrazin-2-yl)-3,6-dihydropyridine-1(2H)-carboxylate: To asolution of 5-bromopyrimidin-2-amine (1000 mg, 5.7 mmol, 1 equiv) indioxane (12 mL), water (2 mL) was added tert-butyl4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydropyridine-1(2H)-carboxylate(2143 mg, 6.93 mmol, 1.2 equiv) and potassium carbonate (2360 mg, 17.1mmol, 3 equiv). The reaction mixture was degassed with nitrogen gas for30 min, followed by the addition of Pd (dppf) Cl₂. DCM (233 mg, 0.28mmol, 0.05 equiv). The resultant reaction mixture was allowed to stir at100° C. for overnight. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, reaction mixture was dilutedwith water (50 mL) and extracted with ethyl acetate (100 mL×2). Organiclayer was washed with water (100 mL) and brine solution (100 mL).Organic layer was dried over anhydrous sodium sulphate and concentratedunder reduced pressure to obtain crude, which was purified by normalphase combi flash to obtain tert-butyl4-(5-aminopyrazin-2-yl)-3,6-dihydropyridine-1(2H)-carboxylate (1000 mg,63%) as a brown solid compound. LCMS: 277 [M+H]⁺

Step-2: Synthesis of tert-butyl 4-(5-aminopyrazin-2-yl)piperidine-1-carboxylate: To a stirred solution of tert-butyl4-(5-aminopyrazin-2-yl)-3, 6-dihydropyridine-1(2H)-carboxylate (400 mg,1.44 mmol, 1 equiv) in ethanol (5 mL), was added Pd/C (20% w/w) (80 mg)under H₂ atm. The resultant reaction mixture was allowed to stir at RTfor 4 h. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, the mixture was passes through celite bedand the filtrate was concentrated under reduced pressure to obtaintert-butyl 4-(5-aminopyrazin-2-yl) piperidine-1-carboxylate (400 mg,99%) as an off white color solid compound. LCMS: 279 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyrazin-2-yl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(200 mg, 0.61 mmol, 1 equiv) in dioxane (5 mL), was added tert-butyl4-(5-aminopyrazin-2-yl)piperidine-1-carboxylate (187 mg, 0.67 mmol, 1.1equiv) and potassium carbonate (168 mg, 1.22 mmol, 2 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of Pd₂(dba)3 (56 mg, 0.06 mmol, 0.1 equiv) and X-phos (58mg, 0.12 mmol, 0.2 equiv). The resultant reaction mixture was allowed tostir at 100° C. for overnight. Progress of the reaction was monitored byTLC and LCMS. After completion of the reaction, diluted with water (30mL) and extracted with ethyl acetate (100 mL). Organic layer was washedwith water (50 mL) and brine solution (50 mL). Organic layer was driedover anhydrous sodium sulphate and concentrated under reduced pressureto obtain crude, which was purified by normal phase combi flash toobtain tert-butyl4-(5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyrazin-2-yl)piperidine-1-carboxylate(250 mg, 72%) as a yellow solid compound. LCMS: 568 [M+H]⁺

Step-4: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperidin-4-yl)pyrazin-2-yl)pyrimidin-2-amine:A solution of tert-butyl4-(5-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyrazin-2-yl)piperidine-1-carboxylate(250 mg, 0.44 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperidin-4-yl)pyrazin-2-yl)pyrimidin-2-amine(2 mg, 1%) as a yellow color solid compound. LCMS: 468 [M+H]⁺; ¹HNMR(DMSO-d₆,400 MHz): δ 10.31 (br. s, 1H), 9.38 (br. s, 1H), 8.65 (d, J=3.4Hz, 1H), 8.25 (br. s, 1H), 7.50 (br. s, 1H), 7.20 (d, J=10.8 Hz, 1H),4.31 (br. s, 2H), 4.15 (d, J=7.3 Hz, 1H), 3.31 (br. s, 7H), 3.17 (br. s,2H), 2.86 (br. s, 2H), 1.02-1.30 ppm (m, 6H).

Example-114 Synthesis of1-(4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazin-1-yl)-2-hydroxyethan-1-one.(Compound 506)

To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-yl)pyridin-2-yl)pyrimidin-2-amine(50 mg, 0.1 mmol, 1 equiv) in DMF (5 mL), was added 2-hydroxyacetic acid(12 mg, 0.16 mmol, 1.2 equiv), DIPEA (0.05 mL, 0.3 mmol, 3 equiv), HOBt(22 mg, 0.16 mmol, 1.5 equiv) and EDC.HCL (31 mg, 0.16 mmol, 1.5 equiv).The reaction mixture was allowed to stir for overnight at RT. Progressof the reaction was monitored by TLC and LCMS. After completion of thereaction, solid observed in the reaction mixture was filtered , washedwith water (10 mL) and dried under vacuum to obtain1-(4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazin-1-yl)-2-hydroxyethan-1-one(20 mg, 36%) as yellow color solid compound. LCMS: 525 [M+H]³⁰ ; ¹HNMR(400 MHz, DMSO-d₆) δ 9.74 (s, 1H), 8.57 (d, J=3.9 Hz, 1H), 7.92-8.15 (m,2H), 7.29-7.55 (m, 2H), 7.17 (d, J=12.2 Hz, 1H), 4.64 (t, J=5.4 Hz, 1H),4.30 (br. s, 2H), 4.14 (d, J=5.9 Hz, 3H), 3.63 (br. s, 2H), 3.51 (br. s,2H), 3.31 (br. s, 2H), 3.11 (br. s, 4H), 1.19 ppm (d, J=6.4 Hz, 6H).

Example-115 Synthesis of4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)benzenesulfonamide.(Compound 507)

To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (5 mL), was added4-aminobenzenesulfonamide (57 mg, 0.33 mmol, 1.1 equiv) and cesiumcarbonate (147 mg, 0.47 mmol, 1.5 equiv). The reaction mixture wasdegassed with nitrogen gas for 30 min, followed by the addition ofpalladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP (8 mg, 0.012mmol, 0.04 equiv). The resultant reaction mixture was allowed to stir at100° C. for overnight. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, diluted with water (30 mL) andextracted with ethyl acetate (100 mL). Organic layer was washed withwater (50 mL) and brine solution (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by reverse phase HPLC to afford4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)benzenesulfonamide(25 mg, 18%) as a yellow color solid compound. LCMS: 462 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d₆) δ 10.14 (s, 1H), 8.65 (d, J=3.9 Hz, 1H), 7.81-7.98(m, J=8.8 Hz, 2H), 7.63-7.81 (m, J=8.8 Hz, 2H), 7.45 (s, 1H), 7.06-7.24(m, 3H), 4.31 (br. s, 2H), 4.15 (d, J=7.3 Hz, 1H), 3.31 (br. s, 2H),1.21 ppm (d, J=6.4 Hz, 6H).

Example-116 Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-4-(piperidin-4-yl)thiazol-2-amine.(Compound 508)

Step-1: Synthesis of tert-butyl 4-(2-bromoacetyl)piperidine-1-carboxylate: To a solution of tert-butyl4-acetylpiperidine-1-carboxylate (500 mg, 2.21 mmol, 1 equiv) in dry THF(5 mL), was added LiHMDS (4 mL, 2.42 mmol, 1.1 equiv) dropwise at -78°C. within 15 min, resulting mixture was stirred at -78° C. for 1 h. Tothis was added TMSCl (0.5 mL, 2.42 mmol, 1.1 equiv) dropwise at -78° C.The reaction mixture was warmed to 0° C. for 10 min and then at roomtemperature for 20 min. Again was cooled to −78° C. To this was addedBromine (0.06 mL, 2.21 mmol, 1 equiv) dropwise at −78° C. The resultantreaction mixture was allowed to stir at room temperature for 15 min.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, diluted with Na2S2O3 solution (10 mL) and NH4Clsolution (10 mL). Reaction mass extracted with ethyl acetate (15 mL).Organic layer was washed with water (5 mL) and brine solution (5 mL).Organic layer was dried over anhydrous sodium sulphate and concentratedunder reduced pressure to obtain tert-butyl 4-(2-bromoacetyl)piperidine-1-carboxylate as crude, which was purified by combiflash byusing 100-200 mesh silica gel column. Yield : 350 mg. LCMS: ELSD 306[M+H]⁺

Step-2: Synthesis of tert-butyl 4-(2-aminothiazol-4-yl)piperidine-1-carboxylate: To a stirred solution of tert-butyl4-(2-bromoacetyl) piperidine-1-carboxylate (200 mg, 0.65 mmol, 1 equiv)in IPA (5 mL), was added thiourea (99 mg, 1.3 mmol, 2 equiv). Resultantmixture was allowed to stir at room temperature for 2 h. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, the mixture was concentrated, diluted with water (10 mL), andwas extracted with EtOAc (15 mL). Organic layer dried over anhydroussodium sulphate and concentrated under reduced pressure to obtain crudecompound was triturated from hexane to afford tert-butyl4-(2-aminothiazol-4-yl) piperidine-1-carboxylate (150 mg) as an oilycompound. LCMS: 284 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(2-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)thiazol-4-yl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (4 mL), was added tert-butyl4-(2-aminothiazol-4-yl)piperidine-1-carboxylate (94 mg, 0.33 mmol, 1.1equiv) and potassium carbonate (62 mg, 0.45 mmol, 1.5 equiv). Thereaction mixture was degassed by nitrogen gas for 10 min, followed bythe addition of Pd2(dba)3 (27 mg, 0.03 mmol, 0.1 equiv) and Xphos (28mg, 0.06 mmol, 0.2 equiv). The resultant reaction mixture was allowed tostir at 100° C. for 16 h. Progress of the reaction was monitored by TLCand LCMS. After completion of the reaction, diluted with water (10 mL)and extracted with ethyl acetate (10 mL). Organic layer was washed withwater (5 mL) and brine solution (5 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain tert-butyl4-(2-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)thiazol-4-yl)piperidine-1-carboxylate(130 mg) as an oily crude residue which used directly for next step.LCMS: 573 [M+H]⁺

Step-4: Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-4-(piperidin-4-yl)thiazol-2-amine:A solution of tert-butyl4-(2-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)thiazol-4-yl)piperidine-1-carboxylate(130 mg crude) in 1.25 M HCl in ethanol (5 mL) was allowed to stir for 1h at 50° C. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, solvent was removed under reduced pressureto obtain crude which was purified by reverse phase HPLC to affordN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-4-(piperidin-4-yl)thiazol-2-amine(18 mg) as an off white solid compound. LCMS: 473 [M+H]³⁰ ; ¹HNMR (400MHz, DMSO-d₆) δ 8.61-8.55 (m, 2H), 8.50 (s, 0H), 8.63-8.55 (m, 2H),8.59-8.53 (m, 2H), 8.51 (s, OH), 8.65-8.52 (m, 3H), 7.71 (s, 1H), 7.36(d, J=11.7 Hz, 1H), 6.67 (s, 1H), 4.38-4.32 (m, 2H), 2.73-2.63 (m, 4H),2.61-2.59 (m, 1H), 4.32-4.24 (m, 1H), 3.40-3.32 (m, 3H), 2.82 (d, J=9.4Hz, 1H), 2.61 (s, 4H), 8.62-8.53 (m, 2H), 2.22-2.13 (m, 2H), 1.91 (t,J=12.7 Hz, 2H), 8.63-8.52 (m, 3H), 1.28 (d, J=6.6 Hz, 7H).

Example-117 Synthesis ofN-(4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)-5,6,7,8-tetrahydro-1,6-naphthyridin-2-amine.(Compound 509)

Step-1: Synthesis of tert-butyl2-((4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine(40 mg, 0.11 mmol, 1 equiv) in dioxane (5 mL), was added tert-butyl2-amino-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate (31 mg, 0.12mmol, 1.1 equiv) and cesium carbonate (54 mg, 0.16 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (1 mg, 0.002 mmol, 0.02 equiv) andBINAP (3 mg, 0.004 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to tert-butyl2-((4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate(50 mg, 78%) as a yellow color solid compound. LCMS: 565 [M+H]⁺

Step-2: Synthesis ofN-(4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)-5,6,7,8-tetrahydro-1,6-naphthyridin-2-amine:A solution of tert-butyl2-((4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)amino)-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate(50 mg, 0.08 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain crude compound, which was purified by reversephase HPLC to obtainN-(4-(4-cyclopentyl-8-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-5-fluoropyrimidin-2-yl)-5,6,7,8-tetrahydro-1,6-naphthyridin-2-amine(8 mg, 20%) as a yellow color solid compound. LCMS: 465 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d₆) δ 9.76 (s, 1H), 8.53 (d, J=3.9 Hz, 1H), 7.94 (d,J=8.3 Hz, 1H), 7.46 (br. s, 1H), 7.33 (d, J=8.3 Hz, 1H), 7.13 (d, J=12.2Hz, 1H), 4.30 (br. s, 2H), 4.02-4.22 (m, 1H), 3.81 (br. s, 2H), 3.31(br. s, 2H), 3.00 (br. s, 2H), 2.67 (br. s, 2H), 1.83 (br. s, 2H), 1.64(br. s, 2H), 1.54 ppm (br. s, 4H).

Example-118 Synthesis of1-(4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-1-yl)-2-hydroxyethan-1-one.(Compound 510)

Step-1: Synthesis of1-(4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-1-yl)-2-hydroxyethan-1-one:To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-aminehydrochloride (80 mg, 0.17 mmol, 1 equiv) in DMF (5 mL), was addedEDC/HC1(49 mg, 0.256 mmol, 1.5equiv), HOBt (35 mg, 0.256 mmol,1.5equiv),DIPEA (0.2 mL, 0.513 mmol, 3 equiv). The reaction mixture wasallowed to stir at RT for overnight. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, the reactionmixture was filtered and washed with water to get yellow solid of1-(4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-1-yl)-2-hydroxyethan-1-one.(05mg, 94.60%) as a yellow color solid compound. LCMS: 525 [M+H]³⁰ ; 1H NMR(400 MHz, DMSO-d6) δ 9.93 (s, 1H), 8.61 (d, J=4.0 Hz, 1H), 8.20 (d,J=2.5 Hz, 1H), 8.13(d, J=8.6 Hz, 1H), 7.62 (dd, J=8.6, 2.5 Hz, 1H), 7.48(s, 1H), 7.19 (d, J=11.5 Hz, 1H), 4.55-4.45 (m,2H), 4.34-4.27 (m, 2H),4.14 (dt, J=13.2,6.5 Hz, 3H), 3.79 (d, J=13.2 Hz, 1H), 3.31 (d, J=4.6Hz,2H), 3.07 (t, J=12.8 Hz, 1H), 2.81 (tt, J=12.3, 3.5 Hz, 1H), 2.68 (d,J=11.2 Hz, 1H), 1.81 (d, J=13.0 Hz, 2H), 1.68-1.43 (m, 2H), 1.23 (s,1H), 1.19 (d, J=6.5 Hz, 6H).

Example-119 Synthesis of(2,6-dimethylmorpholino)(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)methanone.(Compound 511)

Step-1: Synthesis of(6-aminopyridin-3-yl)(2,6-dimethylmorpholino)methanone: To a stirredsolution of 6-aminonicotinic acid (1000 mg, 7.24 mmol, 1 equiv) in DMF(10 mL), was added 2,6-dimethylmorpholine (1250 mg, 10.8 mmol, 1.5equiv), DIPEA (5 mL, 29 mmol, 4 equiv) and HATU (4952 mg, 13 mmol, 1.8equiv). The reaction mixture was allowed to stir for overnight at RT.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, diluted with water (50 mL), solid observed was filteredand dried under vacuum to obtain(6-aminopyridin-3-yl)(2,6-dimethylmorpholino)methanone (800 mg, 69%) asan off white color solid compound. LCMS: 236 [M+H]⁺

Step-2: Synthesis of(2,6-dimethylmorpholino)(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)methanone:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added(6-aminopyridin-3-yl)(2,6-dimethylmorpholino)methanone (78 mg, 0.33mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phaseCombi flash to obtain(2,6-dimethylmorpholino)(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)methanone(20 mg, 12%) as a yellow color solid compound. LCMS: 525 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d₆) δ 10.34 (s, 1H), 8.67 (d, J=3.4 Hz, 1H), 8.37 (s,1H), 8.28 (d, J=8.8 Hz, 1H), 7.80 (dd, J=8.8, 2.0 Hz, 1H), 7.49 (s, 1H),7.20 (d, J=11.7 Hz, 1H), 4.31 (br. s, 2H), 4.05-4.21 (m, 1H), 3.55 (d,J=5.9 Hz, 2H), 3.31 (br. s, 4H), 2.51 (br. s, 2H), 1.19 (d, J=6.4 Hz,6H), 0.91-1.16 ppm (m, 6H).

Example-120 Synthesis of1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazin-2-one.(Compound512)

Step-1: Synthesis tert-butyl4-(6-nitropyridin-3-yl)-3-oxopiperazine-1-carboxylate: To a solution of5-bromo-2-nitropyridine (500 mg, 4.95 mmol, 1 equiv) in Dioxane (10 mL),was added tert-butyl 3-oxopiperazine-1-carboxylate (990 mg, 4.95 mmol,lequiv) and cesium carbonate (4034 mg, 12.3 mmol, 2.5 equiv). Thereaction mixture was purged with nitrogen gas for 30 min, followed bythe addition of Pd₂ (dba)₃ (227 mg, 0.24 mmol, 0.05 equiv) and XATPHOS(230 mg, 0.39 mmol, 0.08 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (50 mL) and extracted with ethylacetate (150 mL×2). Organic layer was washed with water (100 mL) andbrine (100 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude compound, whichwas purified by normal phase combi flash to obtain tert-butyl4-(6-nitropyridin-3-yl)-3-oxopiperazine-1-carboxylate (250 mg, 37%) as ayellow solid compound. LCMS: 323 [M+H]⁺

Step-2: Synthesis of tert-butyl4-(6-aminopyridin-3-yl)-3-oxopiperazine-1-carboxylate: To a stirredsolution of tert-butyl4-(6-nitropyridin-3-yl)-3-oxopiperazine-1-carboxylate (250 mg, 0.77mmol, 1 equiv) in methanol (5 mL), was added Pd/C (20% w/w) (50 mg)under H₂ atm. The resultant reaction mixture was allowed to stir at RTfor 4 h. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, the mixture was passes through celite bedand the filtrate was concentrated under reduced pressure to obtaintert-butyl 4-(6-aminopyridin-3-yl)-3-oxopiperazine-1-carboxylate (200mg, 88%) as an off white color solid compound. LCMS: 293 [M+H]⁺

Step-3; Synthesis of tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-3-oxopiperazine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(200 mg, 0.6 mmol, 1 equiv) in Dioxane (10 mL), was added tert-butyl4-(6-aminopyridin-3-yl)-3-oxopiperazine-1-carboxylate (198 mg, 0.66mmol, 1.1 equiv) and cesium carbonate (293 mg, 0.9 mmol, 1.5 equiv). Thereaction mixture was purged with nitrogen gas for 30 min, followed bythe addition of palladium acetate (3 mg, 0.012 mmol, 0.02 equiv) andBINAP (15 mg, 0.024 mmol, 0.04 equiv). The resultant reaction mixturewas allowed to stir at 100° C. for overnight. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brine(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude compound, which waspurified by normal phase combi flash to obtain tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-3-oxopiperazine-1-carboxylate(100 mg, 28%) as a yellow solid compound. LCMS: 582 [M+H]⁺

Step-4: Synthesis of1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperazin-2-one:tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-3-oxopiperazine-1-carboxylate(100 mg, 0.17 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure to obtaincrude, which was purified by reverse phase HPLC to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperidin-4-yl)pyrazin-2-yl)pyrimidin-2-amine(40 mg, 48%) as a yellow color solid compound. LCMS: 482 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d₆) δ 10.11 (s, 1H), 8.64 (d, J=3.9 Hz, 1H), 8.27 (d,J=2.4 Hz, 1H), 8.21 (d, J=8.8 Hz, 1H), 7.72 (dd, J=9.3, 2.4 Hz, 1H),7.49 (s, 1H), 7.19 (d, J=11.2 Hz, 1H), 4.30 (br. s, 2H), 4.16 (br. s,1H), 3.62 (t, J=5.4 Hz, 2H), 3.40 (br. s, 2H), 3.35 (m, 2H), 3.03 (t,J=5.1 Hz, 2H), 1.19 ppm (d, J=6.4 Hz, 6H).

Example-121: Synthesis of N-(2-(dimethylamino)ethyl)-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)benzenesulfonamide.(Compound 513)

Step-1: Synthesis of N-(2-(dimethylamino)ethyl)-4-nitrobenzenesulfonamide: To a stirred solution of4-nitrobenzenesulfonyl chloride (500 mg, 2.26 mmol, 1 equiv) in DCM (06mL), was added Triethylamine (.4 ml, 4.52 mmol, 2 equiv) and N1,N1-dimethylethane-1,2-diamine (0.4 ml, 4.52 mmol, 2 equiv). The reactionmixture was allowed to stir at RT for 5 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (20 ml) extracted with ethylacetate (25 mL×2). Organic layer was washed with water (15 mL) and brinesolution (20 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by reverse phase HPLC to afford ofN-(2-(dimethylamino)ethyl)-4-nitrobenzenesulfonamide. LCMS: 274 [M+H]⁺

Step-2: Synthesis of 4-amino-N-(2-(dimethylamino) ethyl)benzenesulfonamide: To a stirred solution of N-(2-(dimethylamino)ethyl)-4-nitrobenzenesulfonamide (470 mg, 1.74 mmol, 1 equiv) in ethanol(08 mL), was added Pd/C (100 mg, 0.087 mmol, 0.05 equiv) at RT. Thereaction mixture was allowed to stir at RT for 3 h. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, the reaction mixture was passed through celide filter. Organiclayer was washed with water (20), dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain4-amino-N-(2-(dimethylamino) ethyl) benzenesulfonamide (277 mg, 99%) asbrown compound. LCMS: 244 [M+H]⁺

Step-3: Synthesis ofN-(2-(dimethylamino)ethyl)-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)benzenesulfonamide:To the solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) was added dioxane (5m1) and4-amino-N-(2-(dimethylamino)ethyl)benzenesulfonamide (82 mg, 0.033 mmol,1.1 equiv), cesium carbonate(146 mg, 0.0.46 mmol, 1.5equiv), resultedreaction mixture was degassed with nitrogen for 5 min thereafter wasadded Pd(Oac)₂, (07 mg, 0.031 mmol, 0.1 equiv), BINAP (38 mg, 0.056mmol, 0.2 mmol), resulted reaction mixture was allowed to stir for 15 hat 100° C. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, the reaction mixture was diluted with water(25 mL) and extracted with ethyl acetate (40 mL×2). Organic layer waswashed with water (35 mL) and brine solution (25 mL). Organic layer wasdried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain crude, which was purified by combi-flash to getN-(2-(dimethylamino)ethyl)-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)benzenesulfonamide (35mg,99.90%) as a yellow solid compound. LCMS: 533 [M+H]⁺; ¹H NMR (400MHz, Methanol-d4) δ 8.44 (d, J=4.1 Hz, 1H), 8.30 (d, J=8.8 Hz, 1H), 8.18(s, 1H),7.79-7.71 (m, 1H), 7.52 (s, 1H), 7.29-7.21 (m, 1H), 4.33 (t,J=4.3 Hz, 2H), 4.22 (p, J=6.6 Hz, 1H),3.57-3.44 (m, 1H), 3.35 (t, J=4.4Hz, 4H), 3.14-3.03 (m, 1H), 3.03-2.93 (m, 1H), 2.77 (t, J=9.5 Hz,1H),2.61 (s, 3H), 2.43 (dq, J=14.3, 8.2 Hz, 1H), 2.02 (dt, J=13.3, 7.6 Hz,1H), 1.26 (d, J=6.6 Hz,7H).

Example-122 Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-5-(piperidin-4-yl)thiazol-2-amine.(Compound 514)

Step-1: Synthesis of tert-butyl4-(2-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)thiazol-5-yl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (4 mL), was added tert-butyl4-(2-aminothiazol-4-yl)piperidine-1-carboxylate (94 mg, 0.33 mmol, 1.1equiv) and potassium carbonate (62 mg, 0.45 mmol, 1.5 equiv). Thereaction mixture was degassed by nitrogen gas for 10 min, followed bythe addition of Pd2(dba)3 (27 mg, 0.03 mmol, 0.1 equiv) and Xphos (28mg, 0.06 mmol, 0.2 equiv). The resultant reaction mixture was allowed tostir at 100° C. for 16 h. Progress of the reaction was monitored by TLCand LCMS. After completion of the reaction, diluted with water (10 mL)and extracted with ethyl acetate (10 mL). Organic layer was washed withwater (5 mL) and brine solution (5 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain tert-butyl4-(2-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)thiazol-5-yl)piperidine-1-carboxylate(135 mg) as an viscous crude residue which used directly for next step.LCMS: 573 [M+H] +

Step-2: Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-5-(piperidin-4-yl)thiazol-2-amine:A solution of tert-butyl4-(2-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)thiazol-5-yl)piperidine-1-carboxylate(135 mg crude) in 1.25 M HCl in ethanol (5 mL) was allowed to stir for 1h at 50° C. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, solvent was removed under reduced pressureto obtain crude which was purified by reverse phase HPLC to affordN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-5-(piperidin-4-yl)thiazol-2-amine(10 mg) as an off white solid compound. LCMS: 473 [M+H]⁺; ¹HNMR (400MHz, DMSO-d6) δ 9.74 (s, 1H), 8.57 (d, J=4.0 Hz, 1H), 8.29 (s, 1H), 7.72(dd, J=15.3,2.5 Hz, 1H), 7.44 (s, 1H), 7.36 (dd, J=8.8, 2.5 Hz, 1H),7.16 (d, J=11.4 Hz, 1H), 6.97 (t, J=9.4 Hz,1H), 4.30 (t, J=4.4 Hz, 2H),4.16 (p, J=6.6 Hz, 1H), 3.30 (dd, J=9.6, 5.2 Hz, 4H), 2.63-2.54 (m, 2H),2.22 (s, 7H), 1.84 (dd, J=12.7, 3.6 Hz, 2H), 1.54 (tt, J=13.3, 6.7 Hz,2H), 1.18 (d,J=6.5 Hz, 6H).

Example-123 Synthesis ofN-(5-(2,6-dimethylmorpholino)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine.(Compound 515)

Step-1: Synthesis of 2,6-dimethyl-4-(6-nitropyridin-3-yl)morpholine: Toa stirred solution of 5-bromo-2-nitropyridine (500 mg, 2.47 mmol, 1equiv) in DMSO (10 mL), was added TEA (0.7 mL, 4.94 mmol, 2 equiv) and2,6-dimethylmorpholine (426 mg, 3.7 mmol, 1.5 equiv). The resultantreaction mixture was allowed to stir at 100° C. for overnight. Progressof the reaction was monitored by TLC and LCMS. After completion of thereaction, diluted with water (100 mL), solid observed was filtered anddried under vacuum to obtain2,6-dimethyl-4-(6-nitropyridin-3-yl)morpholine (500 mg, 85%) as a yellowsolid compound. LCMS: 238 [M+H]⁺

Step-2: Synthesis of 5-(2,6-dimethylmorpholino) pyridin-2-amine: To astirred solution of 2,6-dimethyl-4-(6-nitropyridin-3-yl) morpholine (200mg, 0.84 mmol, 1 equiv) in methanol (5 mL), was added Pd/C (20% w/w) (50mg) under H₂ atm. The resultant reaction mixture was allowed to stir atRT for 4 h. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, the mixture was passes through celite bedand the filtrate was concentrated under reduced pressure to obtain5-(2,6-dimethylmorpholino) pyridin-2-amine (150 mg, 86%) as an off whitecolor solid compound. LCMS: 208 [M+H]⁺

Step-3: Synthesis ofN-(5-(2,6-dimethylmorpholino)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (5 mL), was added5-(2,6-dimethylmorpholino)pyridin-2-amine (68 mg, 0.33 mmol, 1.1 equiv)and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv). The reactionmixture was degassed with nitrogen gas for 30 min, followed by theaddition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP(8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtainN-(5-(2,6-dimethylmorpholino)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(80 mg, 52%) as a yellow color solid compound. LCMS: 497 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d₆) δ 9.69 (s, 1H), 8.56 (d, J=3.9 Hz, 1H), 7.92-8.06 (m,2H), 7.46 (s, 1H), 7.38 (d, J=2.4 Hz, 1H), 7.17 (d, J=11.2 Hz, 1H),4.18-4.39 (m, 2H), 3.99-4.15 (m, 1H), 3.64-3.76 (m, 2H), 3.54 (d, J=10.8Hz, 2H), 3.16 (d, J=8.3 Hz, 1H), 2.82 (dd, J=11.5, 5.6 Hz, 1H), 2.26 (t,J=11.0 Hz, 2H), 1.09-1.30 ppm (m, 12H).

Example-124 Synthesis of N-(5-((4-(cyclopropylmethyl) piperazin-1-yl)methyl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine.(Compound 516)

Step-1: Synthesis of tert-butyl 4-((6-aminopyridin-3-yl) methyl)piperazine-1-carboxylate: To a stirred solution of6-aminonicotinaldehyde (500 mg, 8.19 mmol, 1 equiv) in DCE (15 mL), wasadded tert-butyl piperazine-1-carboxylate (1830 mg, 9.8 mmol, 1.2equiv), acetic acid (2.3 mL, 41 mmol, 5 equiv). The reaction mixture wasallowed to stir at RT for 1 h. The reaction mixture was cooled to 0° C,followed by the addition of Na (OAC)₃BH (2604 mg, 12.2 mmol, 1.5 equiv)was added to above mixture and raise the temperature to RT. The reactionmixture was allowed to stir at RT for 1 h. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, the reactionmixture was diluted with saturated solution of NaHCO₃ (50 mL) andextracted with ethyl acetate (100 mL×2). Organic layer was washed withwater (50 mL) and brine solution (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain tert-butyl 4-((6-aminopyridin-3-yl) methyl)piperazine-1-carboxylate (500 mg, 21%) as a brown color viscouscompound. LCMS: 293 [M+H]⁺

Step-2: Synthesis of tert-butyl4-((6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)methyl)piperazine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(500 mg, 1.53 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-((6-aminopyridin-3-yl)methyl)piperazine-1-carboxylate (494 mg, 1.69mmol, 1.1 equiv) and cesium carbonate (748 mg, 2.29 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 30 min, followedby the addition of palladium acetate (7 mg, 0.03 mmol, 0.02 equiv) andBINAP (38 mg, 0.06 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (50 mL) and extracted with ethyl acetate (100 mL×2). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain tert-butyl4-((6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)methyl)piperazine-1-carboxylate(700 mg, 78%) as a brown solid compound. LCMS: 582 [M+H]⁺

Step-3; Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-ylmethyppyridin-2-yl)pyrimidin-2-amine:A solution of tert-butyl4-((6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)methyl)piperazine-1-carboxylate(700 mg, 1.2 mmol, 1 equiv) in 1.25 M HCl in ethanol (10 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain crude compound, which was purified by makingHCl salt to afford5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-ylmethyl)pyridin-2-yl)pyrimidin-2-amine(500 mg, 86%) as a yellow solid compound. LCMS: 482 [M+H]⁺

Step-4: Synthesis of N-(5-((4-(cyclopropylmethyl) piperazin-1-yl)methyl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-ylmethyl)pyridin-2-yl)pyrimidin-2-amine(100 mg, 0.2 mmol, 1 equiv) in DCE (3 mL), was addedcyclopropanecarbaldehyde (52 mg, 0.61 mmol, 3 equiv), acetic acid (0.06mL, 1.0 mmol, 5 equiv). The reaction mixture was allowed to stir at RTfor 1 h. The reaction mixture was cooled to 0° C. NaCNBH₃ (38 mg, 0.61mmol, 3 equiv) was added to above mixture and raise the temperature toRT. The reaction mixture was allowed to stir at RT for 1 h. Progress ofthe reaction was monitored by LCMS. After completion of the reaction,the reaction mixture was diluted with water (25 mL) and extracted withethyl acetate (50 mL×2). Organic layer was washed with water (50 mL) andbrine solution (50 mL). Organic layer was dried over anhydrous sodiumsulphate and concentrated under reduced pressure to obtain crude, whichwas purified by reverse phase HPLC to affordN-(5-((4-(cyclopropylmethyl)piperazin-1-yl)methyl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(45 mg, 41%) as a yellow solid compound. LCMS: 536 [M+H]⁺; ¹HNMR (400MHz, DMSO-d₆) δ 10.01 (s, 1H), 8.62 (d, J=3.8 Hz, 1H), 8.17 (d, J=8.4Hz, 2H), 7.64(dd, J=8.6, 2.4 Hz, 1H), 7.51 (s, 1H), 7.19 (d, J=11.5 Hz,1H), 4.30 (t, J=4.3 Hz, 2H), 4.17 (p, J=6.6 Hz, 1H), 3.43 (s, 2H), 3.31(t, J=4.4 Hz, 2H), 2.40 (s, 8H), 2.14 (d, J=6.5 Hz, 2H), 1.19(d, J=6.5Hz, 6H), 0.79 (p, J=6.2 Hz, 1H), 0.43 (d, J=7.6 Hz, 2H), 0.04 (d, J=4.9Hz, 2H).

Example-125 Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-6-(1-methylpiperidin-4-yl)pyridazin-3-amine.(Compound 517)

Step-1: Synthesis of tert-butyl4-(6-aminopyridazin-3-yl)-3,6-dihydropyridine-1(2H)-carboxylate: To astirred solution of 6-bromopyridazin-3-amine (668 mg, 3.34 mmol, 1equiv) in Dioxane:water (8+2 mL), was added tert-butyl4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydropyridine-1(2H)-carboxylate(1200 mg, 3.34 mmol, 1 equiv), Na₂CO₃(1062 mg, 10.02 mmol, 3equiv.) andPd(PPh₃)Cl₂ (120 mg, 0.167 mmol, 0.05equiv).The resultant reactionmixture was allowed to stir at 100° C. for 16 h. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, the mixture was diluted water (50 mL) and extracted with EtoAc(50 mL×2). Organic layer was washed with water (30 mL) and brine (50mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain of tert-butyl4-(6-aminopyridazin-3-yl)-3,6-dihydropyridine-1(2H)-carboxylate (10 mg,96.17%) as a brown solid compound. LCMS: 277 [M+H]⁺

Step-2: Synthesis of tert-butyl 4-(6-aminopyridazin-3-yl)piperidine-1-carboxylate: To a stirred solution of tert-butyl4-(6-aminopyridazin-3-yl)-3,6-dihydropyridine-1(2H)-carboxylate (200 mg,0.72 mmol, 1 equiv) in ethanol (04 mL), was added PdC (100 mg, 0.087mmol, 0.05 equiv) at RT. The reaction mixture was allowed to stir at RTfor 3 h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, the reaction mixture was passed throughcelide filter. Organic layer was washed with water (20), dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain tert-butyl 4-(6-aminopyridazin-3-yl) piperidine-1-carboxylate(140 mg, 97.10%) as brown compound. LCMS: 279 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridazin-3-yl)piperidine-1-carboxylate:To the solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(200 mg, 0.6 mmol, 1 equiv) was added dioxane (5 ml) and tert-butyl4-(6-aminopyridazin-3-yl)piperidine-1-carboxylate (185 mg, 0.67mmo1,1.1equiv), cesium carbonate(297 mg, 0.91 mmol, 1.5equiv), resultedreaction mixture was degassed with nitrogen for 5 min thereafter wasadded Pd(Oac)₂, (14 mg, 0.061 mmol, 0.1 equiv), BINAP (76 mg, 0.122mmol, 0.2equiv),resulted reaction mixture was allowed to stir for 15 hat 100° C. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, the reaction mixture was diluted with water(20 mL) and extracted with ethyl acetate (30 mL×3). Organic layer waswashed with water (35 mL) and brine solution (15 mL). Organic layer wasdried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain crude, which was purified by combi-flash to gettert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridazin-3-yl)piperazine-1-carboxylate.(360 mg, 33.41%) as a light Brown solid compound. LCMS: 568 [M+H]⁺

Step-4: Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-6-(piperidin-4-yl)pyridazin-3-aminehydrochloride: To the solution of tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridazin-3-yl)piperazine-1-carboxylate(360 mg, 0.81 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 3h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure and the residuewas dried under lyophilizer to getN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-6-(1-methylpiperidin-4-yl)pyridazin-3-amineas a brick red color solid compound. LCMS: 468 [M+H]⁺

Step-5: Synthesis ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-6-(1-methylpiperidin-4-yl)pyridazin-3-amine:To a stirred solution ofN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-6-(1-methylpiperidin-4-yl)pyridazin-3-amine(150 mg, 0.32 mmol, 1 equiv) in DCE (6 mL), was added Formaldehyde (40%in water) (0.33 mL, 0.96 mmol, 3 equiv), acetic acid (0.2 mL, 1.1 mmol,5 equiv). The reaction mixture was allowed to stir at RT for 1 h. Thereaction mixture was cooled to 0° C. NaCNBH₃ (60 mg, 0.91 mmol, 3 equiv)was added to above mixture and raise the temperature to RT. The reactionmixture was allowed to stir at RT for 4 h. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, the reactionmixture was diluted with water (20 mL) and extracted with ethyl acetate(25 mL×2). Organic layer was washed with water (15 mL) and brinesolution (20 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by reverse phase HPLC to affordN-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)-6-(1-methylpiperidin-4-yl)pyridazin-3-amine(8 mg, 98.22%) as a yellow color solid compound. LCMS: 482 [M+H]⁺; ¹HNMR(500 MHz, DMSO-d6) δ 10.58 (s, 1H), 8.64 (d, J=3.7 Hz, 1H), 8.32 (d,J=9.2 Hz, 1H), 7.56(d, J=9.3 Hz, 1H), 7.45 (s, 1H), 7.18 (d, J=11.5 Hz,1H), 4.30 (t, J=4.3 Hz, 2H), 4.14 (p, J=6.6 Hz,1H), 2.89 (d, J=11.3 Hz,2H), 2.79 (t, J=11.8 Hz, 1H), 2.20 (s, 3H), 2.00 (dd, J=12.7, 9.8 Hz,2H),1.87-1.73 (m, 5H), 1.18 (d, J=6.5 Hz, 6H).

Example-126 Synthesis of N-(5-(4-(aminomethyl) piperidin-1-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine. (Compound 518)

Step-1: Synthesis of tert-butyl ((1-(6-nitropyridin-3-yl)piperidin-4-yl) methyl) carbamate. To a stirred solution of5-bromo-2-nitropyridine (200 mg, 0.99 mmol, 1 equiv) in DMSO (5 mL), wasadded K₂CO₃ (273 mg, 1.98 mmol, 2 equiv) and tert-butyl(piperidin-4-ylmethyl) carbamate (424 mg, 1.98 mmol, 2 equiv). Theresultant reaction mixture was allowed to stir at 100° C. for overnight.Progress of the reaction was monitored by LCMS. After completion of thereaction, diluted with water (50 mL), solid observed was filtered anddried under vacuum to obtain tert-butyl((1-(6-nitropyridin-3-yl)piperidin-4-yl)methyl)carbamate (200 mg, 59%)as a yellow color solid compound. LCMS: 337 [M+H]⁺

Step-2: Synthesis of tert-butyl ((1-(6-aminopyridin-3-yl)piperidin-4-yl) methyl) carbamate: To a stirred solution of tert-butyl((1-(6-nitropyridin-3-yl) piperidin-4-yl) methyl) carbamate (200 mg,0.59 mmol, 1 equiv) in methanol (10 mL), was added Pd/C (20% w/w) (40mg). The resultant reaction mixture was allowed to stir at RT for 1 h.Progress of the reaction was monitored by TLC and LCMS. After completionof the reaction, the mixture was passes through celite bed and thefiltrate was concentrated under reduced pressure to obtain tert-butyl((1-(6-aminopyridin-3-yl) piperidin-4-yl) methyl) carbamate (150 mg,82%) as a brown color viscous compound. LCMS: 307 [M+H]⁺

Step-3: Synthesis of tert-butyl((1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-yl)methyl)carbamate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (5 mL), was added tert-butyl((1-(6-aminopyridin-3-yl)piperidin-4-yl)methyl)carbamate (101 mg, 0.33mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain tert-butyl((1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-yl)methyl)carbamate(160 mg, 87%) as a brown color viscous compound. LCMS: 596 [M+H]⁺

Step-4: Synthesis of N-(5-(4-(aminomethyl) piperidin-1-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:tert-butyl((1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-yl)methyl)carbamate(160 mg, 0.26 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure to obtaincrude, which was purified by reverse phase HPLC to obtainN-(5-(4-(aminomethyl)piperidin-1-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(80 mg, 60%) as a yellow color solid compound. LCMS: 496 [M+H]⁺; ¹HNMR(400 MHz, DMSO-d6) δ 9.66 (s, 1H), 8.55 (d, J=4.0 Hz, 1H), 8.05-7.96 (m,2H), 7.46 (s, 1H), 7.39 (dd, J=9.1,3.0 Hz, 1H), 7.21-7.13 (m, 1H), 4.30(t, J=4.3 Hz, 2H), 4.14 (hept,J=7.0 Hz, 1H), 3.64 (d, J=12.0 Hz, 2H),3.30 (t, J=4.2 Hz, 2H), 2.75-2.57 (m, 4H), 1.82 (d, J=12.6 Hz, 2H), 1.62(s, 1H), 1.37-1.20 (m, 2H), 1.18 (d, J=6.5 Hz, 6H).

Example-127 Synthesis of N-(5((4-cyclopentylpiperazin-1-yl) methyl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine.(Compound 519)

Step-1: Synthesis of tert-butyl 4-((6-aminopyridin-3-yl) methyl)piperazine-1-carboxylate: To a stirred solution of6-aminonicotinaldehyde (500 mg, 8.19 mmol, 1 equiv) in DCE (15 mL), wasadded tert-butyl piperazine-1-carboxylate (1830 mg, 9.8 mmol, 1.2equiv), acetic acid (2.3 mL, 41 mmol, 5 equiv). The reaction mixture wasallowed to stir at RT for 1 h. The reaction mixture was cooled to 0° C,followed by the addition of Na (OAC)₃BH (2604 mg, 12.2 mmol, 1.5 equiv)was added to above mixture and raise the temperature to RT. The reactionmixture was allowed to stir at RT for 1 h. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, the reactionmixture was diluted with saturated solution of NaHCO3 (50 mL) andextracted with ethyl acetate (100 mL×2). Organic layer was washed withwater (50 mL) and brine solution (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain tert-butyl 4-((6-aminopyridin-3-yl) methyl)piperazine-1-carboxylate (500 mg, 21%) as a Brown color viscouscompound. LCMS: 293 [M+H]⁺

Step-2: Synthesis of tert-butyl4-((6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)methyl)piperazine-1-carboxylate.To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(500 mg, 1.53 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-((6-aminopyridin-3-yl)methyl)piperazine-1-carboxylate (494 mg, 1.69mmol, 1.1 equiv) and cesium carbonate (748 mg, 2.29 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 30 min, followedby the addition of palladium acetate (7 mg, 0.03 mmol, 0.02 equiv) andBINAP (38 mg, 0.06 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (50 mL) and extracted with ethyl acetate (100 mL×2). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain tert-butyl4-((6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)methyl)piperazine-1-carboxylate(700 mg, 78%) as a brown solid compound. LCMS: 582 [M+H]⁺

Step-3: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-ylmethyppyridin-2-yl)pyrimidin-2-amine.A solution of tert-butyl4-((6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)methyl)piperazine-1-carboxylate(700 mg, 1.2 mmol, 1 equiv) in 1.25 M HCl in ethanol (10 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain crude compound, which was purified by makingHCl salt to afford5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-ylmethyl)pyridin-2-yl)pyrimidin-2-amine(500 mg, 86%) as a yellow solid compound. LCMS: 482 [M+H]⁺

Step-4: Synthesis of N-(5-((4-cyclopentylpiperazin-1-yl) methyl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-ylmethyl)pyridin-2-yl)pyrimidin-2-amine(100 mg, 0.2 mmol, 1 equiv) in DCE (3 mL), was added cyclopentanone (52mg, 0.61 mmol, 3 equiv), acetic acid (0.06 mL, 1.0 mmol, 5 equiv). Thereaction mixture was allowed to stir at RT for 1 h. The reaction mixturewas cooled to 0° C. NaCNBH₃ (38 mg, 0.61 mmol, 3 equiv) was added toabove mixture and raise the temperature to RT. The reaction mixture wasallowed to stir at RT for 1 h. Progress of the reaction was monitored byLCMS. After completion of the reaction, the reaction mixture was dilutedwith water (25 mL) and extracted with ethyl acetate (50 mL×2). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to affordN-(5-((4-cyclopentylpiperazin-1-yl)methyl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(25 mg, 15%) as an off white color solid compound. LCMS: 550 [M+H]⁺;

¹HNMR (400 MHz, DMSO-d6) δ 9.97 (s, 1H), 8.62 (d, J=3.9 Hz, 1H),8.20-8.13 (m,2H), 7.68-7.60 (m, 1H), 7.51 (s, 1H), 7.19 (d, J=11.6 Hz,1H), 4.31 (t, J=4.2 Hz, 2H), 4.17 (p, J=6.8 Hz, 1H), 3.42 (s, 3H), 2.40(dt, J=17.1, 7.8 Hz, 8H), 1.74 (dq, J=11.1, 6.1 Hz, 2H), 1.58 (dq,J=12.0,6.2,4.8 Hz, 2H), 1.48 (q, J=7.3, 5.3 Hz, 2H), 1.28 (dq, J=14.5,8.1 Hz, 2H), 1.20 (d, J=6.5 Hz, 6H).

Example-128 Synthesis of4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)benzenesulfonamide.(Compound 520)

To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (5 mL), was added3-aminobenzenesulfonamide (57 mg, 0.33 mmol, 1.1 equiv) and cesiumcarbonate (147 mg, 0.47 mmol, 1.5 equiv). The reaction mixture wasdegassed with nitrogen gas for 30 min, followed by the addition ofpalladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP (8 mg, 0.012mmol, 0.04 equiv). The resultant reaction mixture was allowed to stir at100° C. for overnight. Progress of the reaction was monitored by TLC andLCMS. After completion of the reaction, diluted with water (30 mL) andextracted with ethyl acetate (100 mL). Organic layer was washed withwater (50 mL) and brine solution (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by reverse phase HPLC to afford4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)benzenesulfonamide(50 mg, 35%) as a yellow color solid compound. LCMS: 462 [M+H]⁺: ¹HNMR(400 MHz, DMSO-d6) δ 10.04 (s, 1H), 8.62 (d, J=3.9 Hz, 1H), 8.27 (t,J=1.9 Hz, 1H), 7.99 (d, J=7.9 Hz, 1H), 7.52-7.37 (m, 3H), 7.31 (s, 2H),7.20 (d, J=11.5 Hz, 1H), 4.30 (t, J=4.3 Hz, 2H),4.15 (h, J=6.5 Hz, 1H),3.30 (d, J=4.5 Hz, 2H), 1.18 (d, J=6.5 Hz, 6H).

Example-129 Synthesis of6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)nicotinamide.(Compound 521)

Step-1: Synthesis of 6-aminonicotinamide: A stirred solution of methyl6-aminonicotinate (300 mg, 1.97 mmol, 1 equiv) in Liq. ammonia (5 mL),was allowed to stir at 70° C. for overnight. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thesolvent was completely removed under reduced pressure to obtain6-aminonicotinamide (250 mg, 93%) as a yellowish color solid compound.LCMS: 138 [M+H]⁺

Step-2: Synthesis of6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)nicotinamide:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (3 mL), was added6-aminonicotinamide (45 mg, 0.33 mmol, 1.1 equiv) and potassiumcarbonate (104 mg, 0.75 mmol, 2.5 equiv). The reaction mixture wasdegassed with nitrogen gas for 30 min, followed by the addition of Pd(dppf) Cl2.DCM (12 mg, 0.015 mmol, 0.05 equiv) and X-Phos (14 mg, 0.03mmol, 0.1 equiv). The resultant reaction mixture was allowed to stir at100° C. for 3 h. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, diluted with water (30 mL) andextracted with ethyl acetate (100 mL). Organic layer was washed withwater (50 mL) and brine solution (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by reverse phase HPLC to obtain6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)nicotinamide(5 mg, 4%) as a yellow color solid compound.LCMS: 427 [M+H]⁺; ¹HNMR (400MHz, DMSO-d6) δ 10.39 (s, 1H), 8.80 (d, J=2.4 Hz, 1H), 8.68 (d, J=3.8Hz, 1H), 8.28(d, J=8.8 Hz, 1H), 8.18 (dd, J=8.8, 2.4 Hz, 1H), 8.00 (s,1H), 7.49 (s, 1H), 7.37 (s, 1H), 7.20 (d, J=11.5 Hz, 1H), 4.31 (t, J=4.3Hz, 2H), 4.17 (h, J=6.8 Hz, 1H), 3.35 (s, 2H), 1.20 (d, J=6.5 Hz, 6H).

Example-130 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-((4-methylpiperazin-1-yl)sulfonyl)phenyl)pyrimidin-2-amine.(Compound 522)

Step-1: Synthesis of tert-butyl 4-((4-nitrophenyl) sulfonyl)piperazine-1-carboxylate. To a stirred solution of4-nitrobenzenesulfonyl chloride (129 mg, 0.58 mmol, 1.3 equiv) in DCM (2ml) was added DIPEA (0.1 mL, 0.59 mmol, 1.1equiv), and tert-butylpiperazine-1-carboxylate (100 mg, 0.0.54 mmol, 1 equiv).The resultantreaction mixture was allowed to stir at RT for 1 h. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, the mixture was diluted water (50 mL) and extracted with DCM(50 mL×2). Organic layer was washed with water (20 mL) and brine (20mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain tert-butylpiperazine-1-carboxylate. (70 mg, 88.75%) as a slightly yellow solidcompound. LCMS: 272 [M+H]⁺

Step-2: Synthesis of tert-butyl 4-((4-aminophenyl) sulfonyl)piperazine-1-carboxylate: To a stirred solution of tert-butyl4-((4-nitrophenyl) sulfonyl) piperazine-1-carboxylate (200 mg, 0.53mmol, 1 equiv) in ethanol: Water (8+2 ml), was added Fe (filling), NH₄Cl(300 mg, 5.39 mmol, 10equiv). The resulted reaction mixture was allowedto stir at 80° C. for 2 h. Progress of the reaction was monitored by TLCand LCMS. After completion of the reaction, the reaction mixture waspassed through celide filter. Organic layer was washed with water (20),dried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain tert-butyl 4-((4-aminophenyl) sulfonyl)piperazine-1-carboxylate (120 mg, 99.10%) as brown compound. LCMS: 242[M+H]⁺

Step-3: Synthesis of tert-butyl4-((4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)sulfonyl)piperazine-1-carboxylate:To the solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(130 mg,0.539 mmol, 1 lequiv) was added dioxane (5 ml) and tert-butyl4-((4-aminophenyl)sulfonyl)piperazine-1-carboxylate (175 mg,0.539 mmol,1equiv), cesium carbonate(258 mg, 0.791 mmol, 1.5equiv), resultedreaction mixture was degassed with nitrogen for 5 min thereafter wasadded Pd(Oac)₂, (20 mg, 0.053 mmol, 0.1equiv), BINAP (80 mg, 0.122 mmol,0.2equiv),resulted reaction mixture was allowed to stir for 15 h at 100°C. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, the reaction mixture was diluted with water (25 mL) andextracted with ethyl acetate (30 mL×3). Organic layer was washed withwater (35 mL) and brine solution (15 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by combi-flash to obtain tert-butyl4-((4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)sulfonyl)piperazine-1-carboxylate(160 mg, 43.13%) as a light brown solid compound. LCMS: 531 [M+H]⁺

Step-4: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-(piperazin-1-ylsulfonyl)phenyl)pyrimidin-2-amine:To the solution tert-butyl4-((4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)sulfonyl)piperazine-1-carboxylate(150 mg, 0.52 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 3h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure and the residuewas dried under lyophilizer to get5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-(piperazin-1-ylsulfonyl)phenyl)pyrimidin-2-amine(50 mg, 41.46%) as a brick red color solid compound. LCMS: 531 [M+H]⁺

Step-5: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-((4-methylpiperazin-1-yl)sulfonyl)phenyl)pyrimidin-2-amine:To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-(piperazin-1-ylsulfonyl)phenyl)pyrimidin-2-amine(300 mg, 0.63 mmol, 1 equiv) in DCE (6 mL), was added Formaldehyde (40%in water) (0.33 mL, 0.96 mmol, 3 equiv), acetic acid (0.2 mL, 1.1 mmol,5 equiv). The reaction mixture was allowed to stir at RT for 1 h. Thereaction mixture was cooled to 0° C. NaCNBH₃ (60 mg, 0.91 mmol, 3 equiv)was added to above mixture and raise the temperature to RT. The reactionmixture was allowed to stir at RT for 4 h. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, the reactionmixture was diluted with water (20 mL) and extracted with ethyl acetate(25 mL×2). Organic layer was washed with water (15 mL) and brinesolution (20 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by reverse phase HPLC to afford5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(4-((4-methylpiperazin-1-yl)sulfonyl)phenyl)pyrimidin-2-amine(10 mg, 98.22%) as a yellow color solid compound. LCMS: 545 [M+H]⁺;¹HNMR (400 MHz, DMSO-d6) δ 10.30 (s, 1H), 8.67 (d, J=3.8 Hz, 1H), 8.44(s, 1H), 8.02 (d, J=8.5 Hz, 2H), 7.64 (d, J=8.5 Hz, 2H), 7.44 (s, 1H),7.19 (d, J=11.8 Hz, 1H), 4.31 (t, J=4.2 Hz, 2H), 4.16(p, J=6.6 Hz, 1H),3.32 (t, J=4.5 Hz, 3H), 3.14 (s, 2H), 2.94-2.83 (m, 4H), 2.35 (t, J=4.6Hz, 6H),2.13 (s, 3H), 1.19 (d, J=6.5 Hz, 6H).

Example-131 Synthesis of4-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-ylamino)-N-(2-methoxyethyl)benzenesulfonamide.(Compound 523)

Step-1: Synthesis of N-(2-methoxyethyl)-4-nitro-benzenesulfonamide: Astirred solution of 4-nitrobenzenesulfonyl chloride (100 mg, 0.45 mmol,lequiv) in DCM (5 ml) was added DIPEA (0.2 mL, 0.59 mmol, 1.1equiv), and2-methoxyethanamine (100 mg, 0.54 mmol, 1 equiv).The resultant reactionmixture was allowed to stir at RT for 1 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, the mixturewas diluted water (20 mL) and extracted with DCM (15 mL×2). Organiclayer was washed with water (20 mL) and brine (20 mL). Organic layer wasdried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain N-(2-methoxyethyl)-4-nitro-benzenesulfonamide (70 mg,88.75%) as a slightly yellow solid compound. LCMS: 260 [M+H]⁺

Step-2: Synthesis of 4-amino-N-(2-methoxyethyl)benzenesulfonamide: To astirred solution of N-(2-methoxyethyl)-4-nitro-benzenesulfonamide (200mg, 0.76 mmol, 1 equiv) in ethanol: Water (8+2m1), was added Fe(filling), NH₄Cl (407 mg, 7.6 mmol, 10equiv). The resulted reactionmixture was allowed to stir at 80° C. for 5 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, thereaction mixture was passed through celide filter. Organic layer waswashed with water (30), dried over anhydrous sodium sulphate andconcentrated under reduced pressure to4-amino-N-(2-methoxyethyl)benzenesulfonamide (129 mg, 99.10%) as browncompound. LCMS: 242 [M+H]⁺

Step-3: Synthesis of4-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-ylamino)-N-(2-methoxyethyl)benzenesulfonamide:To the solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(130 mg,0.53 mmol, 1equiv) was added dioxane (5 ml),(2Z)-N4-(2-methoxyethyl)penta-2,4-diene-1,4-diamine(175 mg,0.539 mmol,1equiv), cesium carbonate(258 mg, 0.791 mmol, 1.5equiv), resultedreaction mixture was degassed with nitrogen for 5 min thereafter wasadded Pd(Oac)₂, (20 mg, 0.053 mmol, 0.1equiv), BINAP (80 mg, 0.122 mmol,0.2equiv),resulted reaction mixture was allowed to stir for 15 h at 100°C. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, the reaction mixture was diluted with water (30 mL) andextracted with ethyl acetate (30 mL×3). Organic layer was washed withwater (35 mL) and brine solution (15 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by Reverse phase HPLC to4-(5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-ylamino)-N-(2-methoxyethyl)benzenesulfonamide(75 mg, 98.13%) as a yellow colour solid compound. LCMS: 520 [M+H]⁺;¹HNMR (400 MHz, DMSO-d6) δ 10.19 (s, 1H), 8.65 (d, J=3.9 Hz, 1H), 7.94(d, J=8.7 Hz, 2H), 7.70(d, J=8.6 Hz, 2H), 7.54 (t, J=6.0 Hz, 1H), 7.44(s, 1H), 7.22-7.14 (m, 1H), 4.31 (t, J=4.3 Hz, 2H),4.15 (p, J=6.6 Hz,1H), 3.29 (d, J=6.0 Hz, 2H), 3.17 (s, 3H), 2.88 (q, J=5.9 Hz, 2H), 1.20(d, J=6.5 Hz, 7H).

Example-132 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-((4-(2-methoxyethyl)piperazin-1-yl)methyl)pyridin-2-yl)pyrimidin-2-amine.(Compound 524)

To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-ylmethyl)pyridin-2-yl)pyrimidin-2-amine(500 mg, 1.03 mmol, 1 equiv) in DMF (8 mL), was added K₂CO₃ (200 mg,1.98 mmol, 2 equiv) and 1-bromo-2-methoxyethane (1000 mg, 1.58 mmol, 2equiv). The resultant reaction mixture was allowed to stir at 100° C.for overnight. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, diluted with water (50 mL), extracted withethylacetate (30 mL×3): water(30 mL). resulted organic layer and driedunder vacuum thereafter organic layer was purified by reverse phasechromatography to5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-((4-(2-methoxyethyl)piperazin-1-yl)methyl)pyridin-2-yl)pyrimidin-2-amine(0.05 mg, 93.83%) as a yellow color solid compound. LCMS: 540 [M+H]⁺;¹HNMR (400 MHz, DMSO-d6) δ 9.98 (s, 1H), 8.62 (d, J=4.0 Hz, 1H), 8.17(d, J=8.6 Hz, 2H), 7.64(dd, J=8.4, 2.5 Hz, 1H), 7.51 (s, 1H), 7.19 (d,J=11.7 Hz, 1H), 4.30 (t, J=4.3 Hz, 2H), 4.17 (p, J=6.6 Hz, 1H), 3.42(dd, J=11.7, 5.9 Hz, 4H), 3.22 (s, 3H), 2.45-2.35 (m, 8H), 1.20 (d,J=6.5 Hz, 6H).

Example-133 Synthesis of N-(5-(4-aminopiperidin-1-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine.(Compound 788)

Step-1: Synthesis of tert-butyl (1-(6-nitropyridin-3-yl) piperidin-4-yl)carbamate: To a stirred solution of 5-bromo-2-nitropyridine (300 mg,1.48 mmol, 1 equiv) in DMSO (5 mL), was added K₂CO₃ (410 mg, 2.97 mmol,2 equiv) and tert-butyl piperidin-4-ylcarbamate (594 mg, 2.97 mmol, 2equiv). The resultant reaction mixture was allowed to stir at 100° C.for overnight. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, diluted with water (50 mL), solid observedwas filtered and dried under vacuum to obtain tert-butyl(1-(6-nitropyridin-3-yl)piperidin-4-yl)carbamate (400 mg, 83%) as ayellow color solid compound. LCMS: 323 [M+H]⁺

Step-2: Synthesis of tert-butyl (1-(6-aminopyridin-3-yl) piperidin-4-yl)carbamate: To a stirred solution of tert-butyl (1-(6-nitropyridin-3-yl)piperidin-4-yl) carbamate (200 mg, 0.62 mmol, 1 equiv) in methanol (10mL), was added Pd/C (20% w/w) (40 mg). The resultant reaction mixturewas allowed to stir at RT for 1 h. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, the mixturewas passes through celite bed and the filtrate was concentrated underreduced pressure to obtain tert-butyl (1-(6-aminopyridin-3-yl)piperidin-4-yl) carbamate (150 mg, 82%) as a purple color solidcompound. LCMS: 293 [M+H]⁺

Step-3: Synthesis of tert-butyl(1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-yl)carbamate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0. 3 mmol, 1 equiv) in dioxane (5 mL), was added tert-butyl(1-(6-aminopyridin-3-yl)piperidin-4-yl)carbamate (96 mg, 0.33 mmol, 1.1equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv). The reactionmixture was degassed with nitrogen gas for 30 min, followed by theaddition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP(8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain tert-butyl(1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-yl)carbamate(150 mg, 84%) as a brown color viscous compound. LCMS: 582 [M+H]⁺

Step-4: Synthesis of N-(5-(4-aminopiperidin-1-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:tert-butyl(1-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidin-4-yl)carbamate(150 mg, 0.26 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure to obtaincrude, which was purified by reverse phase HPLC to obtainN-(5-(4-aminopiperidin-1-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(60 mg, 48%) as a yellow color solid compound. LCMS: 482 [M+H]⁺; ¹HNMR:(DMSO-d₆,400 MHz): δ 9.68 (s, 1H), 8.56 (d, J=3.9 Hz, 1H), 7.84-8.05 (m,2H), 7.46 (s, 1H), 7.39 (dd, J=8.8, 2.6 Hz, 1H), 7.17 (d, J=11.4 Hz,1H), 4.30 (br. s, 2H), 4.02-4.18 (m, 1H), 3.63 (d, J=12.3 Hz, 2H), 3.30(br. s, 2H), 2.98 (br. s, 1H), 2.74 (t, J=11.6 Hz, 2H), 1.90 (d, J=11.4Hz, 2H), 1.53 (d, J=9.6 Hz, 2H), 1.19 ppm (d, J=6.1 Hz, 6H).

Example-134 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-((4-methylpiperazin-1-yl)methyl)pyridin-2-yl)pyrimidin-2-amine.(Compound 789)

Step-1: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-((4-methylpiperazin-1-yl)methyl)pyridin-2-yl)pyrimidin-2-amine:To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperazin-1-ylmethyl)pyridin-2-yl)pyrimidin-2-amine(100 mg, 0.2 mmol, 1 equiv) in DCE (3 mL), was added formaldehyde(40% inwater) (0.03 mL, 0.61 mmol, 3 equiv), acetic acid (0.06 mL, 1.0 mmol, 5equiv). The reaction mixture was allowed to stir at RT for 1 h. Thereaction mixture was cooled to 0° C. NaCNBH₃ (38 mg, 0.61 mmol, 3 equiv)was added to above mixture and raise the temperature to RT. The reactionmixture was allowed to stir at RT for 1 h. Progress of the reaction wasmonitored by LCMS. After completion of the reaction, the reactionmixture was diluted with water (25 mL) and extracted with ethyl acetate(50 mL×2). Organic layer was washed with water (50 mL) and brinesolution (50 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by reverse phase HPLC to afford5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-((4-methylpiperazin-1-yl)methyl)pyridin-2-yl)pyrimidin-2-amine(10 mg, 10%) as an off white color solid compound. LCMS: 496 [M+H]⁺;¹HNMR (DMSO-d₆,400 MHz): δ 9.97 (s, 1H), 8.62 (d, J=3.9 Hz, 1H),8.06-8.23 (m, 1H), 7.64 (d, J=10.5 Hz, 1H), 7.51 (s, 1H), 7.19 (d,J=11.8 Hz, 1H), 4.31 (br. s, 2H), 4.04-4.21 (m, 1H), 3.43 (s, 2H), 3.30(t, J=4.2 Hz, 2H), 2.35 (d, J=18.9 Hz, 8H), 2.15 (s, 3H), 1.20 ppm (d,J=6.1 Hz, 6H).

Example-135 Synthesis of2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)benzamide.(Compound 790)

Step-1: Synthesis of2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)benzonitrile:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(500mg, 1.53 mmol, 1 equiv) in dioxane (5 mL), was4-amino-2-fluorobenzonitrile (280 mg, 1.69 mmol, 1.1 equiv) and cesiumcarbonate (745 mg, 2.29 mmol, 1.5 equiv). The reaction mixture wasdegassed with nitrogen gas for 30 min, followed by the addition ofpalladium acetate (35 mg, 0.153 mmol, 0.02 equiv) and BINAP (191 mg,0.36 mmol, 0.2 equiv). The resultant reaction mixture was allowed tostir at 100° C. for overnight. Progress of the reaction was monitored byTLC and LCMS. After completion of the reaction, diluted with water (30mL) and extracted with ethyl acetate (100 mL). Organic layer was washedwith water (50 mL) and brine solution (50 mL). Organic layer was driedover anhydrous sodium sulphate and concentrated under reduced pressureto obtain2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)benzonitrile(400 mg, 84%) as a brown color viscous compound. LCMS: 426[M+H]⁺

Step-2: Synthesis of2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)benzamide:To a solution of2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)benzonitrile(200 mg, 0.46 mmol, 1 equiv) in DMSO (5 mL), was added K₂CO₃(126 mg,0.93 mmol, 2 equiv) and H₂O₂(80 mg, 1.84 mmol, 4 equiv). The resultantreaction mixture was allowed to stir at RT for 2 h. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, diluted with water (30 mL) and extracted with ethyl acetate(100 mL). Organic layer was washed with water (50 mL) and brine solution(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to and purified by reverse phaseChromatography to obtain2-fluoro-4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)benzamide(5 mg, 99.48%) as a light yellow color solid compound. LCMS: 444 [M+H]⁺;¹H NMR (400 MHz, DMSO-d₆) δ ppm 8.26 (d, J=7.91, 8.25 Hz, 1H) 8.10 (d,J=8.20 Hz, 1H) 7.81 (t, J=8.20 Hz, 1H) 7.5 (s, 1H) 7.42(d, 1H) 8.20 (dd,1H), 4.32 (d, 3H), 3.45 (s, 1H) 1.23 (s, 6H).

Example-136 Synthesis of4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-N-(piperidin-4-yl)benzenesulfonamide.(Compound 791)

Step-1: Synthesis of tert-butyl 4-((4-nitrophenyl) sulfonyl)piperazine-1-carboxylate. To a stirred solution of4-nitrobenzenesulfonyl chloride (500 mg, 2.26 mmol, lequiv) in DCM (10mL) was added TEA (0.5 mL, 3.39 mmol, 1.5equiv), and tert-butylpiperazine-1-carboxylate (407 mg, 4.07 mmol, 1.8 equiv).The resultantreaction mixture was allowed to stir at RT for overnight. Progress ofthe reaction was monitored by TLC and LCMS. After completion of thereaction, the mixture was diluted water (50 mL) and extracted with DCM(50 mL×2). Organic layer was washed with water (50 mL) and brine (50mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain tert-butylpiperazine-1-carboxylate. (500 mg, 57%) as a light brown color solidcompound. LCMS: 386 [M+H]⁺

Step-2: Synthesis of tert-butyl 4-((4-aminophenyl) sulfonyl)piperazine-1-carboxylate: To a stirred solution of tert-butyl4-((4-nitrophenyl) sulfonyl) piperazine-1-carboxylate (200 mg, 0.51mmol, 1 equiv) in in methanol (10 mL), was added Pd/C (20% w/w) (40 mg)under H₂ atm. The resultant reaction mixture was allowed to stir at RTfor 4 h. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, the mixture was passes through celite bedand the filtrate was concentrated under reduced pressure to obtaintert-butyl 4-(6-aminopyridin-3-yl)-3-oxopiperazine-1-carboxylate (160mg, 86%) as an off white color solid compound. LCMS: 356 [M+H]⁺

Step-3: Synthesis of tert-butyl4-((4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)phenyl)sulfonyl)piperazine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in Dioxane (10 mL), was added tert-butyl4-(6-aminopyridin-3-yl)-3-oxopiperazine-1-carboxylate (117 mg, 0.33mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv).The reaction mixture was purged with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, thereaction mixture was diluted with water (30 mL) and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brine(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-3-oxopiperazine-1-carboxylate(150 mg, 76%) as a brown color viscous compound. LCMS: 645 [M+H]⁺

Step-4: Synthesis of4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-N-(piperidin-4-yl)benzenesulfonamide:tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)-3-oxopiperazine-1-carboxylate(150 mg, 0.23 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at 50° C. for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, solvent was removed under reduced pressure to obtaincrude, which was purified by reverse phase HPLC to obtain4-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-N-(piperidin-4-yl)benzenesulfonamide(2 mg, 2%) as a yellow color solid compound. LCMS: 545 [M+H]⁺; ¹HNMR(DMSO-d₆, 400 MHz): δ 10.21 (br. s, 1H), 8.65 (br. s, 1H), 7.94 (d,J=8.3 Hz, 2H), 7.71 (d, J=7.9 Hz, 2H), 7.60 (br. s, 1H), 7.44 (br. s,1H), 7.18 (d, J=12.3 Hz, 1H), 4.31 (br. s, 2H), 4.16 (br. s, 1H), 3.39(m, 2H), 3.17 (br. s, 1H), 2.99 (br. s, 2H), 2.92 (br. s, 2H), 2.09 (br.s, 1H), 1.54 (br. s, 2H), 1.36 (br. s, 2H), 1.20 ppm (d, J=6.1 Hz, 6H).

Example-137 Synthesis of5-fluoro-N-(3-fluoro-4-((4-methylpiperazin-1-yl)methyl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine.(Compound 792)

Step-1: Synthesis of 1-(2-fluoro-4-nitrobenzyl)-4-methylpiperazine : Toa stirred solution of 1-(bromomethyl)-2-fluoro-4-nitrobenzene (300 mg,1.29 mmol, 1 equiv) in THF (10 mL), was added 1-methylpiperazine (386mg, 3.87 mmol, 3 equiv) and DIPEA (0.7 mL, 3.87 mmol, 3 equiv). Theresultant reaction mixture was allowed to stir at RT for overnight.Progress of the reaction was monitored by LCMS and NMR. After completionof the reaction, diluted with water (30 mL), and extracted with ethylacetate (100 mL). Organic layer was washed with water (50 mL) and brinesolution (50 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain1-(2-fluoro-4-nitrobenzyl)-4-methylpiperazine (300 mg, 92%) as a yellowviscous compound. LCMS: 254 [M+H]⁺

Step-2: Synthesis of 3-fluoro-4((4-methylpiperazin-1-yl)methyl)aniline:To a stirred solution of 1-(2-fluoro-4-nitrobenzyl)-4-methylpiperazine(300 mg, 1.18 mmol, 1 equiv) in in methanol (10 mL), was added Pd/C (20%w/w) (60 mg) under H₂ atm. The resultant reaction mixture was allowed tostir at RT for 1 h. Progress of the reaction was monitored by LCMS.After completion of the reaction, the mixture was passes through celitebed and the filtrate was concentrated under reduced pressure to obtain3-fluoro-4-((4-methylpiperazin-1-yl)methyl)aniline (200 mg, 75%) as anoff white color solid compound. LCMS: 224 [M+H]⁺

Step-3: Synthesis of5-fluoro-N-(3-fluoro-4-((4-methylpiperazin-1-yl)methyl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added3-fluoro-4-((4-methylpiperazin-1-yl)methyl)aniline (74 mg, 0.33 mmol,1.1 equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv). Thereaction mixture was degassed with nitrogen gas for 30 min, followed bythe addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtain5-fluoro-N-(3-fluoro-4-((4-methylpiperazin-1-yl)methyl)phenyl)-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(50 mg, 32%) as a yellow color solid compound. LCMS: 513 [M+H]⁺; ¹HNMR(DMSO-d₆, 400 MHz): d 9.93 (s, 1H), 8.61 (d, J=3.9 Hz, 1H), 7.77 (dd,J=12.9, 1.5 Hz, 1H), 7.37-7.52 (m, 2H), 7.22-7.29 (m, 1H), 7.17 (d,J=11.0 Hz, 1H), 4.30 (t, J=3.9 Hz, 2H), 4.17 (s, 1H), 3.44 (s, 2H),3.13-3.39 (m, 2H), 2.38 (br. s, 4H), 2.33 (br. s, 4H), 2.15 (s, 3H),1.18 ppm (d, J=6.6 Hz, 6H).

Example-138 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(1-methylpiperidin-4-yl)-6-(trifluoromethyl)pyridin-2-yl)pyrimidin-2-amine.(Compound 841)

Step-1: Synthesis of tert-butyl 6-amino-2-(trifluoromethyl)-3′,6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate: To a solution of5-bromo-6-(trifluoromethyl)pyridin-2-amine (500 mg, 2.07 mmol, 1 equiv)in dioxane : water (10 mL : 3 mL), was added tert-butyl4-(4,4,5,5-tetramethyl-1,3, 2-dioxaborolan-2-yl)-3,6-dihydropyridine-1(2H)-carboxylate (705 mg, 2.28 mmol, 1.1 equiv) andsodium carbonate (329 mg, 3.11 mmol, 1.5 equiv). The reaction mixturewas degassed with nitrogen gas for 30 min, followed by the addition ofPd(PPh₃)₂Cl₂ (72 mg, 0.1 mmol, 0.05 equiv). The resultant reactionmixture was allowed to stir at 100° C. for 6 h. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction,reaction mixture was diluted with water (20 mL) and extracted with ethylacetate (25 mL×2). Combined organic layer was washed with water (30 mL)and brine solution (30 mL). Organic layer was dried over anhydroussodium sulphate and concentrated under reduced pressure to obtain crude,which was purified by normal phase combi flash by using 100-200 meshsilica gel column to afford tert-butyl 6-amino-2-(trifluoromethyl)-3′,6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate (450 mg, 63%) as anoffwhite solid compound compound. LCMS: 343 [M+H]⁺

Step-2: Synthesis of tert-butyl4-(6-amino-2-(trifluoromethyl)pyridin-3-yl)piperidine-1-carboxylate: Toa stirred solution of tert-butyl 6-amino-2-(trifluoromethyl)-3′,6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate (200 mg, 0.58 mmol, 1equiv) in methanol (10 mL), was added Pd/C (10 wt. %) (40 mg) under H₂atm. The resultant reaction mixture was allowed to stir at RT for 6 h.Progress of the reaction was monitored by LCMS. After completion of thereaction, the mixture was passes through celite bed and the filtrate wasconcentrated under reduced pressure to afford tert-butyl4-(6-amino-2-(trifluoromethyl)pyridin-3-yl)piperidine-1-carboxylate (180mg, 90%) as an off white solid compound. LCMS: 345 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-(trifluoromethyl)pyridin-3-yl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(150 mg, 0.45 mmol, 1 equiv) in dioxane (6 mL), was tert-butyl4-(6-amino-2-(trifluoromethyl)pyridin-3-yl)piperidine-1-carboxylate (175mg, 0.5 mmol, 1.1 equiv) and cesium carbonate (224 mg, 0.69 mmol, 1.5equiv). The reaction mixture was degassed with nitrogen gas for 10 min,followed by the addition of palladium acetate (10 mg, 0.046 mmol, 0.1equiv) and BINAP (57 mg, 0.092 mmol, 0.2 equiv). The resultant reactionmixture was allowed to stir at 100° C. for overnight. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, diluted with water (10 mL) and extracted with ethyl acetate(15 mL). Organic layer was washed with water (10 mL) and brine solution(10 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude, which was purifiedby normal phase combi flash by using 100-200 mesh silica gel column toobtain tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-(trifluoromethyl)pyridin-3-yl)piperidine-1-carboxylate(120 mg, 41%) as a yellow solid compound. LCMS: 635 [M+H]⁺

Step-4: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperidin-4-yl)-6-(trifluoromethyl)pyridin-2-yl)pyrimidin-2-aminehydrochloride: A solution of tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-(trifluoromethyl)pyridin-3-yl)piperidine-1-carboxylate(120 mg, 0.2 mmol, 1 equiv) in 1.25 M HCl in ethanol (4 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperidin-4-yl)-6-(trifluoromethyl)pyridin-2-yl)pyrimidin-2-aminehydrochloride (90 mg, 84%) as a yellow solid compound. LCMS: 535 [M+H]⁺

Step-5: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(1-methylpiperidin-4-yl)-6-(trifluoromethyl)pyridin-2-yl)pyrimidin-2-amine: To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperidin-4-yl)-6-(trifluoromethyl)pyridin-2-yl)pyrimidin-2-amine(100 mg, 0.19 mmol, 1 equiv) in DCE (5 mL), was added Formaldehyde (30%in water) (84 mg, 0.93 mmol, 5 equiv), acetic acid (57 mg, 0.93 mmol, 5equiv). The reaction mixture was allowed to stir at RT for 1 h. Thereaction mixture was cooled to 0° C. NaCNBH₃ (23 mg, 0.38 mmol, 2 equiv)was added to above mixture and raised the temperature to RT. Thereaction mixture was allowed to stir at RT for 4 h. Progress of thereaction was monitored by LCMS. After completion of the reaction, thereaction mixture was diluted with water (20 mL) and extracted with ethylacetate (20 mL×2). Organic layer was washed with water (20 mL) and brinesolution (20 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by reverse phase HPLC to afford5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(1-methylpiperidin-4-yl)-6-(trifluoromethyl)pyridin-2-yl)pyrimidin-2-amine(15 mg, 14%) as a solid compound. LCMS: 549 [M+H]⁺; ¹HNMR (400 MHz,Methanol-d4) δ 8.61 (d, J=8.8 Hz, 1H), 8.47 (d, J=4.0 Hz, 1H),7.94 (d,J=8.9 Hz, 1H), 7.53 (s, 1H), 7.30-7.22 (m, 1H), 4.33 (t, J=4.4 Hz, 1H),4.24 (p,J=6.5 Hz, 1H), 3.23 (d, J=12.0 Hz, 3H), 3.04 (s, 2H), 2.52 (d,J=19.5 Hz, 5H), 2.16 (s, OH), 1.96-1.86 (m, 4H), 1.32-1.21 (m, 6H).

Example-139 Synthesis ofN-(5-(4-((dimethylamino)methyl)piperidin-1-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine.(Compound 842)

Step-1: Synthesis ofN,N-dimethyl-1-(1-(6-nitropyridin-3-yl)piperidin-4-yl)methanamine: To astirred solution of 5-bromo-2-nitropyridine (500 mg, 2.46 mmol, 1 equiv)in DMSO (8 mL), was added N,N-dimethyl-1-(piperidin-4-yl)methanamine(635 mg, 2.95 mmol, 1.2 equiv) and K₂CO₃ (679 mg, 4.92 mmol, 2 equiv).The resultant reaction mixture was allowed to stir at 100° C. forovernight. Progress of the reaction was monitored by LCMS and NMR. Aftercompletion of the reaction, diluted with ice water (30 mL), solidobserved was filtered and dried under vacuum to obtainN,N-dimethyl-1-(1-(6-nitropyridin-3-yl)piperidin-4-yl)methanamine (500mg, 77%) as a yellow color solid compound. LCMS: 265 [M+H]⁺

Step-2: Synthesis of 5-(4-((dimethyl amino) methyl) piperidin-1-yl)pyridin-2-amine: To a stirred solution ofN,N-dimethyl-1-(1-(6-nitropyridin-3-yl) piperidin-4-yl) methanamine (200mg, 0.75 mmol, 1 equiv) in in methanol (10 mL), was added Pd/C (20% w/w)(40 mg) under H₂ atm. The resultant reaction mixture was allowed to stirat RT for 1 h. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, the mixture was passes through celite bedand the filtrate was concentrated under reduced pressure to obtain5-(4-((dimethyl amino) methyl) piperidin-1-yl) pyridin-2-amine (150 mg,85%) as an off white color solid compound. LCMS: 235 [M+H]⁺

Step-3: Synthesis ofN-(5-(4-((dimethylamino)methyl)piperidin-1-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added5-(4-((dimethyl amino)methyl)piperidin-1-yl)pyridin-2-amine (77 mg, 0.33mmol, 1.1 equiv) and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) andBINAP (8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtainN-(5-(4-((dimethylamino)methyl)piperidin-1-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(20 mg, 12%) as a yellow color solid compound. LCMS: 524 [M+H]⁺; ¹HNMR:(DMSO-d₆, 400 MHz): δ 9.66 (s, 1H), 8.56 (d, J=3.9 Hz, 1H), 7.82-8.09(m, 2H), 7.47 (br. s, 1H), 7.28-7.43 (m, 1H), 7.17 (d, J=12.3 Hz, 1H),4.30 (br. s, 2H), 4.16 (d, J=6.6 Hz, 1H), 3.61 (d, J=12.3 Hz,2H), 3.25(br. s, 2H), 2.52-2.73 (m, 3H), 2.12 (s, 6H), 2.08 (d, J=7.9 Hz, 2H),1.79 (d, J=10.5 Hz, 2H), 1.58 (br. s, 2H), 1.10-1.29 ppm (m, 6H).

Example-140 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(4-methoxypiperidin-1-yl)pyridin-2-yl)pyrimidin-2-aminehydrochloride. (Compound 843)

Step-1: Synthesis of 5-(4-methoxypiperidin-1-yl)-2-nitropyridine: To astirred solution of 5-bromo-2-nitropyridine (500 mg, 2.46 mmol, 1 equiv)in DMSO (8 mL), was added 1-4-methoxypiperidine (567 mg, 4.92 mmol, 2equiv) and K₂CO₃ (679 mg, 4.92 mmol, 2 equiv). The resultant reactionmixture was allowed to stir at 100° C. for overnight. Progress of thereaction was monitored by LCMS and NMR. After completion of thereaction, diluted with water (30 mL), solid observed was filtered anddried under vacuum to obtain 5-(4-methoxypiperidin-1-yl)-2-nitropyridine(500 mg, 86%) as a yellow color solid compound. LCMS: 238 [M+H]⁺

Step-2: Synthesis of 5-(4-methoxypiperidin-1-yl)pyridin-2-amine: To astirred solution of 5-(4-methoxypiperidin-1-yl)-2-nitropyridine (200 mg,0.84 mmol, 1 equiv) in in methanol (10 mL), was added Pd/C (20% w/w) (40mg) under H₂ atm. The resultant reaction mixture was allowed to stir atRT for 1 h. Progress of the reaction was monitored by LCMS. Aftercompletion of the reaction, the mixture was passes through celite bedand the filtrate was concentrated under reduced pressure to obtain5-(4-methoxypiperidin-1-yl)pyridin-2-amine (150 mg, 86%) as an off whitecolor solid compound. LCMS: 208 [M+H]⁺

Step-3: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(4-methoxypiperidin-1-yl)pyridin-2-yl)pyrimidin-2-amine:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.3 mmol, 1 equiv) in dioxane (10 mL), was added5-(4-methoxypiperidin-1-yl)pyridin-2-amine (69 mg, 0.33 mmol, 1.1 equiv)and cesium carbonate (147 mg, 0.47 mmol, 1.5 equiv). The reactionmixture was degassed with nitrogen gas for 30 min, followed by theaddition of palladium acetate (2 mg, 0.006 mmol, 0.02 equiv) and BINAP(8 mg, 0.012 mmol, 0.04 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by reverse phaseHPLC to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(4-methoxypiperidin-1-yl)pyridin-2-yl)pyrimidin-2-amine(110 mg, 72%) as a yellow color solid compound. LCMS: 497 [M+H]⁺

Step-4: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N(5-(4-methoxypiperidin-1-yl)pyridin-2-yl)pyrimidin-2-aminehydrochloride:5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(4-methoxypiperidin-1-yl)pyridin-2-yl)pyrimidin-2-amine(30 mg, 0.06 mmol, 1 equiv) was taken in 1.25 M HCl in ethanol (5 mL)and the resultant reaction mixture was allowed to stir at RT for 1 h.Solvent was removed under reduced pressure and the residue was driedunder lyophilizer to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(4-methoxypiperidin-1-yl)pyridin-2-yl)pyrimidin-2-aminehydrochloride (20 mg, 67%) as a brick red color solid compound. LCMS:497 [M+H]⁺; ¹HNMR: (DMSO-d₆, 400 MHz, HCl salt): δ1.66 (br. s, 1H), 8.77(d, J=3.5 Hz, 1H), 8.11-8.30 (m, 1H), 7.94 (br. s, 1H), 7.72 (br. s,1H), 7.39 (s, 1H), 7.20 (d, J=11.0 Hz, 1H), 4.24-4.38 (m, 2H), 4.14 (dt,J=13.2,6.6 Hz, 1H), 3.50 (br. s, 3H), 3.32 (br. s, 2H), 3.28 (s, 3H),3.07 (br. s, 2H), 1.97 (br. s, 2H), 1.60 (br. s, 2H), 1.18 ppm (d, J=6.6Hz, 6H).

Example-141 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-methoxy-5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine.(Compound 844)

Step-1: Synthesis of tert-butyl 6-amino-2-methoxy-3′,6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate: To a solution of5-bromo-6-methoxypyridin-2-amine (200 mg, 0.98 mmol, 1 equiv) in dioxane: water (10 mL : 3 mL), was added tert-butyl4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydropyridine-1(2H)-carboxylate(334 mg, 1.08 mmol, 1.1 equiv) and sodium carbonate (158 mg, 1.47 mmol,1.5 equiv). The reaction mixture was degassed with nitrogen gas for 30min, followed by the addition of Pd(PPh₃)₂Cl₂ (34 mg, 0.049 mmol, 0.05equiv). The resultant reaction mixture was allowed to stir at 100° C.for 6 h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, reaction mixture was diluted with water (20mL) and extracted with ethyl acetate (25 mL×2). Combined organic layerwas washed with water (30 mL) and brine solution (30 mL). Organic layerwas dried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain crude, which was purified by normal phase combi flashby using 100-200 mesh silica gel column to afford tert-butyl6-amino-2-methoxy-3′, 6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate(210 mg, 70%) as an offwhite solid compound compound. LCMS: 306 [M+H]⁺

Step-2: Synthesis of tert-butyl4-(6-amino-2-methoxypyridin-3-yl)piperidine-1-carboxylate: To a stirredsolution of tert-butyl 6-amino-2-methoxy-3′,6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate (300 mg, 0.98 mmol, 1equiv) in methanol (10 mL), was added Pd/C (10 wt. %) (50 mg) under H₂atm. The resultant reaction mixture was allowed to stir at RT for 6h.Progress of the reaction was monitored by LCMS. After completion of thereaction, the mixture was passes through celite bed and the filtrate wasconcentrated under reduced pressure to afford tert-butyl4-(6-amino-2-methoxypyridin-3-yl)piperidine-1-carboxylate (270 mg, 88%)as a transparent oil compound. LCMS: 308 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yppyrimidin-2-yl)amino)-2-methoxypyridin-3-yl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(100 mg, 0.31 mmol, 1 equiv) in dioxane (3 mL), was added tert-butyl4-(5-aminopyridin-2-yl) piperidine-1-carboxylate (104 mg, 0.33 mmol, 1.1equiv) and cesium carbonate (151 mg, 0.46 mmol, 1.5 equiv). The reactionmixture was degassed with nitrogen gas for 10 min, followed by theaddition of palladium acetate (7 mg, 0.03 mmol, 0.1 equiv) and BINAP (39mg, 0.06 mmol, 0.2 equiv). The resultant reaction mixture was allowed tostir at 100° C. for overnight. Progress of the reaction was monitored byTLC and LCMS. After completion of the reaction, diluted with water (10mL) and extracted with ethyl acetate (15 mL). Organic layer was washedwith water (10 mL) and brine solution (10 mL). Organic layer was driedover anhydrous sodium sulphate and concentrated under reduced pressureto obtain crude, which was purified by normal phase combi flash toobtain tert-butyl4-(6((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-methoxypyridin-3-yl)piperidine-1-carboxylate(90 mg, 49%) as a yellow solid compound. LCMS: 597 [M+H]⁺

Step-4: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-methoxy-5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-aminehydrochloride: A solution of tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-methoxypyridin-3-yl)piperidine-1-carboxylate(120 mg, 0.2 mmol, 1 equiv) in 1.25 M HCl in ethanol (4 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-methoxy-5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-aminehydrochloride (90 mg, 90%) as a yellow solid compound. LCMS: 497 [M+H]⁺

Step-5: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-methoxy-5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine: To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-methoxy-5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-aminehydrochloride salt (200 mg, 0.4 mmol, 1 equiv) in DCE (5 mL), was addedFormaldehyde (30% in water) (180 mg, 2 mmol, 5 equiv), acetic acid (120mg, 2 mmol, 5 equiv). The reaction mixture was allowed to stir at RT for1 h. The reaction mixture was cooled to 0° C. NaCNBH₃ (49 mg, 0.8 mmol,2 equiv) was added to above mixture and raise the temperature to RT. Thereaction mixture was allowed to stir at RT for 4 h. Progress of thereaction was monitored by LCMS. After completion of the reaction, thereaction mixture was diluted with water (20 mL) and extracted with ethylacetate (20 mL×2). Organic layer was washed with water (20 mL) and brinesolution (20 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by reverse phase HPLC to afford5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-methoxy-5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine(6 mg, 15%) as a yellow color solid compound. LCMS: 511 [M+H]⁺; ¹HNMR:(400 MHz, Methanol-d4) δ 8.43 (d, J=4.1 Hz, 1H), 7.92 (d, J=8.1 Hz, 1H),7.53 (s, 1H),7.50 (d, J=8.2 Hz, 1H), 7.26 (d, J=11.6 Hz, 1H), 4.33 (t,J=4.3 Hz, 2H), 4.24 (p, J=6.6 Hz, 1H), 3.96(s, 3H), 3.58 (d, J=12.2 Hz,2H), 3.36 (d, J=4.9 Hz, 2H), 3.20-3.02 (m, 3H), 2.91 (s, 3H), 2.11 (d,J=14.3 Hz, 2H), 2.00 (dd, J=17.6, 7.3 Hz, 2H), 1.27 (d, J=6.6 Hz, 6H).

Example-142 Synthesis of6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3-(1-methylpiperidin-4-yl)picolinonitrile.(Compound 845)

Step-1: Synthesis of tert-butyl 6-amino-2-cyano-3′,6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate: To a solution of6-amino-3-bromopicolinonitrile (200 mg, 1.01 mmol, 1 equiv) in dioxane(4 mL), was added tert-butyl4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydropyridine-1(2H)-carboxylate(376 mg, 1.2 mmol, 1 equiv) and a solution of sodium carbonate (318 mg,3.03 mmol, 3 equiv). The reaction mixture was degassed with nitrogen gasfor 15 min, followed by the addition of Pd (PPh₃)₂Cl₂ (36 mg, 0.05 mmol,0.05 equiv). The resultant reaction mixture was allowed to stir at 100°C. for 3 h. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, reaction mixture was diluted withwater (30 mL) and extracted with ethyl acetate (100 mL×2). Organic layerwas washed with water (100 mL) and brine solution (100 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to obtain tert-butyl 6-amino-2-cyano-3′,6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate (200 mg, 66%) as an offwhite color solid compound. LCMS: 301 [M+H]⁺

Step-2: Synthesis of tert-butyl4-(6-amino-2-cyanopyridin-3-yl)piperidine-1-carboxylate: To a stirredsolution of tert-butyl 6-amino-2-cyano-3′,6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate (200 mg, 3.2 mmol, 1equiv) in ethanol (10 mL), was added Pd/C (20% w/w) (40 mg) under H₂atm. The resultant reaction mixture was allowed to stir at RT for 4 h.Progress of the reaction was monitored by LCMS. After completion of thereaction, the mixture was passes through celite bed and the filtrate wasconcentrated under reduced pressure to obtain tert-butyl4-(6-amino-2-cyanopyridin-3-yl) piperidine-1-carboxylate (180 mg, 90%)as a dark brown solid compound. LCMS: 303 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(2-cyano-6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(150 mg, 0.46 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(6-amino-2-cyanopyridin-3-yl)piperidine-1-carboxylate (151 mg, 0.50mmol, 1.1 equiv) and cesium carbonate (225 mg, 0.69 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 30 min, followedby the addition of palladium acetate (2 mg, 0.009 mmol, 0.02 equiv) andBINAP (12 mg, 0.018 mmol, 0.04 equiv). The resultant reaction mixturewas allowed to stir at 100° C. for overnight. Progress of the reactionwas monitored by TLC and LCMS. After completion of the reaction, dilutedwith water (30 mL) and extracted with ethyl acetate (100 mL). Organiclayer was washed with water (50 mL) and brine solution (50 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to obtain tert-butyl4-(2-cyano-6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidine-1-carboxylate(200 mg, 74%) as a brown viscous compound. LCMS: 592 [M+H]⁺

Step-4: Synthesis of6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3-(piperidin-4-yl)picolinonitrilehydrochloride: A solution of tert-butyl4-(2-cyano-6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidine-1-carboxylate(200 mg, 3.38 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3-(piperidin-4-yl)picolinonitrilehydrochloride (150 mg, 90%) as a yellow solid compound. LCMS:492 [M+H]⁺

Step-5: Synthesis of6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3-(1-methylpiperidin-4-yl)picolinonitrile:To a stirred solution of6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3-(piperidin-4-yl)picolinonitrilehydrochloride salt (100 mg, 0.2 mmol, 1 equiv) in DCE (3 mL), was addedFormaldehyde (40% in water) (0.02 mL, 0.6 mmol, 3 equiv), acetic acid(0.06 mL, 1.0 mmol, 5 equiv). The reaction mixture was allowed to stirat RT for 1 h. The reaction mixture was cooled to 0° C. NaCNBH₃ (39 mg,0.6 mmol, 3 equiv) was added to above mixture and raise the temperatureto RT. The reaction mixture was allowed to stir at RT for 1 h. Progressof the reaction was monitored by LCMS. After completion of the reaction,the reaction mixture was diluted with water (25 mL) and extracted withethyl acetate (50 mL×2). Organic layer was washed with water (50 mL) andbrine solution (50 mL). Organic layer was dried over anhydrous sodiumsulphate and concentrated under reduced pressure to obtain crude, whichwas purified by reverse phase HPLC to afford6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-3-(1-methylpiperidin-4-yl)picolinonitrile(5 mg, 5%) as a yellow color solid compound. LCMS: 506 [M+H]⁺; ¹HNMR:(DMSO-d₆, 400 MHz): δ 10.54 (s, 1H), 8.66 (d, J=3.9 Hz, 1H), 8.43 (d,J=8.8 Hz, 1H), 7.94 (d, J=9.2 Hz, 1H), 7.47 (s, 1H), 7.19 (d, J=11.4 Hz,1H), 4.30 (d, J=3.9 Hz, 2H), 4.09-4.20 (m, 1H), 3.25 (br. s, 2H), 2.91(d, J=11.0 Hz, 2H), 2.76 (br. s, 1H), 2.21 (s, 3H), 1.98 (d, J=11.4 Hz,2H), 1.75 (br. s, 4H), 1.00-1.24 ppm (m, 6H).

Example-143 Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-fluoro-5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine.(Compound 846)

Step-1: Synthesis of tert-butyl 6-amino-2-fluoro-3′,6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate: To a solution of5-bromo-6-fluoropyridin-2-amine (500 mg, 2.1 mmol, 1 equiv) in dioxane :water (10 mL : 3 mL), was added tert-butyl4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydropyridine-1(2H)-carboxylate(714 mg, 2.31 mmol, 1.1 equiv) and sodium carbonate (333 mg, 3.15 mmol,1.5 equiv). The reaction mixture was degassed with nitrogen gas for 30min, followed by the addition of Pd(PPh₃)₂Cl₂ (74 mg, 0.11 mmol, 0.05equiv). The resultant reaction mixture was allowed to stir at 100° C.for 6 h. Progress of the reaction was monitored by TLC and LCMS. Aftercompletion of the reaction, reaction mixture was diluted with water (20mL) and extracted with ethyl acetate (25 mL×2). Combined organic layerwas washed with water (30 mL) and brine solution (30 mL). Organic layerwas dried over anhydrous sodium sulphate and concentrated under reducedpressure to obtain crude, which was purified by normal phase combi flashby using 100-200 mesh silica gel column to afford tert-butyl6-amino-2-fluoro-3′, 6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate(400 mg, 55%) as an offwhite solid compound. LCMS: 294 [M+H]⁺

Step-2: Synthesis of tert-butyl4-(6-amino-2-fluoropyridin-3-yl)piperidine-1-carboxylate: To a stirredsolution of tert-butyl 6-amino-2-fluoro-3′,6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate (400 mg, 1.53 mmol, 1equiv) in methanol (15 mL), was added Pd/C (10 wt. %) (80 mg) under H₂atm. The resultant reaction mixture was allowed to stir at RT for 6 h.Progress of the reaction was monitored by LCMS. After completion of thereaction, the mixture was passes through celite bed and the filtrate wasconcentrated under reduced pressure to afford tert-butyl4-(6-amino-2-fluoropyridin-3-yl)piperidine-1-carboxylate (370 mg, 80%)as an off white solid compound. LCMS: 296 [M+H]⁺

Step-3: Synthesis of tert-butyl4-(2-fluoro-6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidine-1-carboxylate:To a solution of6-(2-chloro-5-fluoropyrimidin-4-yl)-8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazine(150 mg, 0.45 mmol, 1 equiv) in dioxane (10 mL), was added tert-butyl4-(6-amino-2-fluoropyridin-3-yl)piperidine-1-carboxylate (147 mg, 0.5mmol, 1.1 equiv) and cesium carbonate (224 mg, 0.69 mmol, 1.5 equiv).The reaction mixture was degassed with nitrogen gas for 10 min, followedby the addition of palladium acetate (10 mg, 0.046 mmol, 0.1 equiv) andBINAP (57 mg, 0.092 mmol, 0.2 equiv). The resultant reaction mixture wasallowed to stir at 100° C. for overnight. Progress of the reaction wasmonitored by TLC and LCMS. After completion of the reaction, dilutedwith water (10 mL) and extracted with ethyl acetate (15 mL). Organiclayer was washed with water (10 mL) and brine solution (10 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash by using 100-200 mesh silica gel column to obtain tert-butyl4-(2-fluoro-6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidine-1-carboxylate(120 mg, 44%) as a yellow solid compound. LCMS: 585 [M+H]⁺

Step-4: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-fluoro-5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-aminehydrochloride: A solution tert-butyl4-(2-fluoro-6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidine-1-carboxylate(120 mg, 0.2 mmol, 1 equiv) in 1.25 M HCl in ethanol (4 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-fluoro-5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-aminehydrochloride (90 mg, 84%) as a yellow solid compound. LCMS: 485 [M+H]⁺

Step-5: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-fluoro-5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine:To a stirred solution of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-fluoro-5-(piperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine(105 mg, 0.22 mmol, 1 equiv) in DCE (5 mL), was added Formaldehyde (30%in water) (97 mg, 1.08 mmol, 5 equiv), acetic acid (65 mg, 1.08 mmol, 5equiv). The reaction mixture was allowed to stir at RT for 1 h. Thereaction mixture was cooled to 0° C. NaCNBH₃ (27 mg, 0.44 mmol, 2 equiv)was added to above mixture and raised the temperature to RT. Thereaction mixture was allowed to stir at RT for 4 h. Progress of thereaction was monitored by LCMS. After completion of the reaction, thereaction mixture was diluted with water (20 mL) and extracted with ethylacetate (20 mL×2). Organic layer was washed with water (20 mL) and brinesolution (20 mL). Organic layer was dried over anhydrous sodium sulphateand concentrated under reduced pressure to obtain crude, which waspurified by reverse phase HPLC to afford5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(6-fluoro-5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine(21 mg, 20%) as a solid compound. LCMS: 499 [M+]⁺; ¹HNMR: (400 MHz,Methanol-d4) δ 8.45 (d, J=3.9 Hz, 1H), 8.22 (dd, J=8.2, 1.6 Hz, 1H),7.74 (dd, J=10.0, 8.2 Hz, 1H), 7.50 (s, 1H), 7.25 (d, J=11.9 Hz, 1H),4.33 (t, J=4.3 Hz, 2H), 4.22 (p, J=6.7 Hz,1H), 3.53 (d, J=12.4 Hz, 2H),3.35 (t, J=4.4 Hz, 2H), 3.12-2.99 (m, 3H), 2.85 (s, 3H), 2.15-1.97(m,4H), 1.26 (d, J=6.5 Hz, 6H).

Example-144 Synthesis of N-(6-cyclopropyl-5-(1-methylpiperidin-4-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(Compound 847) and Example-145: Synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(1-methylpiperidin-4-yl)-6-propylpyridin-2-yl)pyrimidin-2-amine(Compound 848)

Step-1: Synthesis of 6-cyclopropylpyridin-2-amine: To a solution of6-bromopyridin-2-amine (2000 mg, 11.6 mmol, 1 equiv) in Toluene (20 mL),was added cyclopropylboronic acid (1996 mg, 23.2 mmol, 1 equiv) and asolution of potassium phosphate (4930 mg, 23.2 mmol, 3 equiv) in water(10 mL). The reaction mixture was degassed with nitrogen gas for 15 min,followed by the addition of Pd (OAc)₂ (262 mg, 1.16 mmol, 0.1 equiv) andtricyclohexylphosphine (488 mg, 1.74 mmol, 0.15 equiv). The resultantreaction mixture was allowed to stir at 100° C. for overnight in asealed tube. Progress of the reaction was monitored by TLC and LCMS.After completion of the reaction, reaction mixture was diluted withwater (100 mL) and extracted with ethyl acetate (150 mL×2). Organiclayer was washed with water 100 mL) and brine solution (100 mL). Organiclayer was dried over anhydrous sodium sulphate and concentrated underreduced pressure to obtain crude, which was purified by normal phasecombi flash to obtain 6-cyclopropylpyridin-2-amine (1000 mg, 64%) as ayellow oil compound. LCMS: 135 [M+H]⁺

Step-2: Synthesis of 5-bromo-6-cyclopropylpyridin-2-amine: To a stirredsolution of 6-cyclopropylpyridin-2-amine (900 mg, 6.7 mmol, 1 equiv) inDMF (10 mL), was added NBS (1196 mg, 6.7 mmol, 1 equiv). The resultantreaction mixture was allowed to stir at RT for 1 h. Progress of thereaction was monitored by LCMS and TLC. After completion of thereaction, diluted with water (50 mL), and extracted with ethyl acetate(150 mL). Organic layer was washed with water (50 mL) and brine solution(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude, which was purifiedby normal phase combi flash to obtain5-bromo-6-cyclopropylpyridin-2-amine (900 mg, 63%) as an off white solidcompound. LCMS: 213 [M+H]⁺

Step-3: Synthesis of tert-butyl 6-amino-2-cyclopropyl-3′,6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate: To a solution of5-bromo-6-cyclopropylpyridin-2-amine (800 mg, 3.77 mmol, 1 equiv) indioxane (8 mL), was added tert-butyl4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydropyridine-1(2H)-carboxylate(1399 mg, 4.5 mmol, 1.2 equiv) and a solution of sodium carbonate (1188mg, 11.3 mmol, 3 equiv) I water (2 mL). The reaction mixture wasdegassed with nitrogen gas for 15 min, followed by the addition of Pd(PPh₃)₂Cl₂ (132 mg, 0.18 mmol, 0.05 equiv). The resultant reactionmixture was allowed to stir at 100° C. for overnight. Progress of thereaction was monitored by TLC and LCMS. After completion of thereaction, reaction mixture was diluted with water (30 mL) and extractedwith ethyl acetate (100 mL×2). Organic layer was washed with water (100mL) and brine solution (100 mL). Organic layer was dried over anhydroussodium sulphate and concentrated under reduced pressure to obtain crude,which was purified by normal phase combi flash to obtain tert-butyl6-amino-2-cyclopropyl-3′,6′-dihydro-[3,4′-bipyridine]-1′(2′H)-carboxylate (800 mg, 67%) as an offwhite color solid compound. LCMS: 316 [M+H]⁺

Step-4: Synthesis of tert-butyl4-(6-amino-2-cyclopropylpyridin-3-yl)piperidine-1-carboxylate andsynthesis of tert-butyl4-(6-amino-2-propylpyridin-3-yl)piperidine-1-carboxylate: To a stirredsolution of tert-butyl 6-amino-2-cyclopropyl-3′,6′-dihydro[3,4′-bipyridine]-1′(2′H)-carboxylate (300 mg, 0.95 mmol, 1equiv) in ethanol (10 mL), was added Pd/C (20% w/w) (60 mg) under H₂atm. The resultant reaction mixture was allowed to stir at RT for 4 h.Progress of the reaction was monitored by LCMS. After completion of thereaction, the mixture was passes through celite bed and the filtrate wasconcentrated under reduced pressure to obtain a mixture of tert-butyl4-(6-amino-2-cyclopropylpyridin-3-yl) piperidine-1-carboxylate andtert-butyl 4-(6-amino-2-propylpyridin-3-yl)piperidine-1-carboxylate (250mg, 83%) as an off white solid compound. LCMS: 318 [M+H]⁺, 320 [M+H]⁺

Step-5: Synthesis of tert-butyl4-(2-cyclopropyl-6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidine-1-carboxylateand synthesis of tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-propylpyridin-3-yl)piperidine-1-carboxylate:To the solution of mixture of tert-butyl4-(6-amino-2-cyclopropylpyridin-3-yl) piperidine-1-carboxylate andtert-butyl 4-(6-amino-2-propylpyridin-3-yl)piperidine-1-carboxylate (150mg, 0.46 mmol, 1 equiv) in dioxane (10 mL), was added a mixture oftert-butyl 4-(6-amino-2-cyclopropylpyridin-3-yl)piperidine-1-carboxylateand tert-butyl 4-(6-amino-2-propylpyridin-3-yl)piperidine-1-carboxylate(160 mg, 0.50 mmol, 1.1 equiv) and cesium carbonate (225 mg, 0.69 mmol,1.5 equiv). The reaction mixture was degassed with nitrogen gas for 30min, followed by the addition of palladium acetate (2 mg, 0.009 mmol,0.02 equiv) and BINAP (12 mg, 0.018 mmol, 0.04 equiv). The resultantreaction mixture was allowed to stir at 100° C. for overnight. Progressof the reaction was monitored by TLC and LCMS. After completion of thereaction, diluted with water (30 mL) and extracted with ethyl acetate(100 mL). Organic layer was washed with water (50 mL) and brine solution(50 mL). Organic layer was dried over anhydrous sodium sulphate andconcentrated under reduced pressure to obtain crude, which was purifiedby normal phase combi flash to obtain a mixture of tert-butyl4-(2-cyclopropyl-6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidine-1-carboxylateand tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-propylpyridin-3-yl)piperidine-1-carboxylate(200 mg, 71%) as a brown viscous compound. LCMS: 607 [M+H]⁺, 609 [M+H]⁺

Step-6: Synthesis ofN-(6-cyclopropyl-5-(piperidin-4-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-aminehydrochloride and synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperidin-4-yl)-6-propylpyridin-2-yl)pyrimidin-2-aminehydrochloride: A solution of a mixture of tert-butyl4-(2-cyclopropyl-6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)pyridin-3-yl)piperidine-1-carboxylateand tert-butyl4-(6-((5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-yl)amino)-2-propylpyridin-3-yl)piperidine-1-carboxylate(200 mg, 0.33 mmol, 1 equiv) in 1.25 M HCl in ethanol (5 mL) was allowedto stir for 1 h at 50° C. Progress of the reaction was monitored byLCMS. After completion of the reaction, solvent was removed underreduced pressure to obtain a mixture ofN-(6-cyclopropyl-5-(piperidin-4-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-aminehydrochloride and5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperidin-4-yl)-6-propylpyridin-2-yl)pyrimidin-2-aminehydrochloride (140 mg, 84%) as a yellow solid compound. LCMS: 507[M+H]⁺, 509 [M+H]⁺

Step-7: Synthesis ofN-(6-cyclopropyl-5-(1-methylpiperidin-4-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amineand synthesis of5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(1-methylpiperidin-4-yl)-6-propylpyridin-2-yl)pyrimidin-2-amine:To the stirred solution of mixture ofN-(6-cyclopropyl-5-(piperidin-4-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine and5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(piperidin-4-yl)-6-propylpyridin-2-yl)pyrimidin-2-amine(hydrodhloride salt) (100 mg, 0.197 mmol, 1 equiv) in DCE (3 mL), wasadded Formaldehyde (40% in water) (0.02 mL, 0.59 mmol, 3 equiv), aceticacid (0.06 mL, 1.0 mmol, 5 equiv). The reaction mixture was allowed tostir at RT for 1 h. The reaction mixture was cooled to 0° C. NaCNBH₃ (37mg, 0.59 mmol, 3 equiv) was added to above mixture and raise thetemperature to RT. The reaction mixture was allowed to stir at RT for 1h. Progress of the reaction was monitored by LCMS. After completion ofthe reaction, the reaction mixture was diluted with water (25 mL) andextracted with ethyl acetate (50 mL×2). Organic layer was washed withwater (50 mL) and brine solution (50 mL). Organic layer was dried overanhydrous sodium sulphate and concentrated under reduced pressure toobtain crude, which was purified by reverse phase HPLC to afford PeaklasN-(6-cyclopropyl-5-(1-methylpiperidin-4-yl)pyridin-2-yl)-5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)pyrimidin-2-amine(15 mg, 14.5%) as a yellow colored solid compound and Peak2 as5-fluoro-4-(8-fluoro-4-isopropyl-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-(5-(1-methylpiperidin-4-yl)-6-propylpyridin-2-yl)pyrimidin-2-amine(15 mg, 14.5%) as a yellow colored solid compound. PEAK-1: LCMS: 521[M+H]⁺; ¹HNMR: (DMSO-d6 ,400 MHz): δ 9.56 (br. s, 1H), 8.61 (d, J=4.4Hz, 1H), 7.94 (d, J=8.3 Hz, 1H), 7.30-7.54 (m, 2H), 7.22 (d, J=4.4 Hz,1H), 4.31 (br. s, 2H), 4.06-4.18 (m, 1H), 3.53 (d, J=12.3 Hz, 2H), 3.30(br. s, 2H), 3.15 (d, J=12.3 Hz, 2H), 2.81 (s, 3H), 2.25 (br. s, 2H),1.99-2.15 (m, 2H), 1.84-1.89 (m, 2H), 1.11-1.30 (m, 6H), 1.04 (br. s,2H), 0.90 ppm (br. s, 2H).

PEAK-2: LCMS: 523 [M+H]⁺; ¹HNMR: (DMSO-d₆, 400 MHz): δ 9.73 (s, 1H),8.60 (d, J=3.9 Hz, 1H), 8.02 (d, J=9.2 Hz, 1H), 7.41-7.61 (m, 2H), 7.20(d, J=11.4 Hz, 1H), 4.30 (br. s, 2H), 4.03-4.27 (m, 1H), 3.30 (br. s,2H), 3.13 (m, 3H), 2.55-2.73 (m, 5H), 1.74 (br. s, 4H), 1.45-1.69 (m,4H), 1.08-1.29 (m, 6H), 0.97 ppm (t, J=7.2 Hz, 3H).

Compounds 40-46, 48-51, 53-177, 179-205, 207-435, 525-787 and 791-840may be synthesized by the general synthetic schemes 1-7 or according tothe experimental details as exemplified in Examples 1-145 using theappropriate starting materials and reagents.

Biological Examples Example B1 In Vitro Kinase Inhibition IC₅₀Determination

IC₅₀ values of compounds against CDK4 and CDK6 were determined byluminescence using retinoblastoma as substrate. Kinase assays wereperformed in kinase buffer (#PV6135, Invitrogen, Life Technologies GrandIsland, N.Y.) where total reaction volume was 30 μL/well in 96-well halfarea white plates (#3693, Costar). One microliter of 25×test compoundsat specific concentrations (e.g, final concentration range: 0.1 nM-200nM) were mixed with 10 μL of 2.5×kinase (5 nM, CDK4 #PR8064A and CDK6#PR8422B, Invitrogen) solution and 14 μL of 4× mixed solution withretinoblastoma (1 μM, #12-439, EMD Millipore, Haywood, Calif.) and ATP(25 μM, #V7038, Promega, Madison, Wis.). The plates were covered andincubated for 2 h at room temperature. At the end of incubation, 25 μLof stop solution—ADP Glo reagent (#V7002, Promega) was added. Afterincubation for 45 min at room temperature, 50 μL of detection reagent(##V7002, Promega) was added. Readings were taken at 15 min and 45 minincubation after detection reagent was added in a Synergy Neo Platereader (BioTek, Winooski) at single excitation of 340 nm and Dualemission at 495 nm and 520 nm respectively. The following equations wereused in the CDK4 and CDK6 assay data analysis. Percent inhibition (100-%activity) was fitted to the “four-parameter logistic model” in XLfit fordetermination of IC₅₀ values.

Percent conversion ofenzyme=100-{(RLU_(No Drug−No enzyme)*100)/RLU_(No drug+Enzyme)}  Equation1:

Percent conversion at each datapoint=100-{(RLU_(Average_Drug+enzyme))*100)/RLU_(No drug+Enzyme)}  Equation2:

Percent Inhibition=100*(% Conversion_(each data point)/%Conversion_(Enzyme))   Equation 3:

IC₅₀ values of compounds against CDK1 (cyclin B) were determined byZ′-LYTE™. These screening assays were performed at Invitrogen LifeTechnologies (Grand Island, N.Y.)on a low volume NBS, black 384-wellplate (#4514, Corning). 0.1 μL of 100× test compound in 100% DMSO (atspecific solutions) were mixed with 2.4 μL of Kinase Buffer (50 mM HEPESpH 7.5, 0.01% BRIJ-35, 10 mM MgCl₂, 1 mM EGTA), 5 μL of 2× Kinase(3.5-46.4 ng CDK1/cyclin B)/Peptide (2 μM Ser/Thr 18), and 2.5 μL of4×ATP solution (34 μM). The plates were shaken for 30 seconds, andincubated for 60 minutes at room temperature. Development ReagentSolution (5 μL of 1:1024 dilution) was added to the plates followed withanother 30-second plate shake, and the plates were further incubated atroom temperature for one hour. The plates were read on fluorescenceplate reader with Dual emission at 445 nm and 520 nm.

IC₅₀ values of compounds against CDK2 (cyclin A) were determined byZ′-LYTE™. These screening assays were performed at Invitrogen LifeTechnologies (Grand Island, N.Y.) on a low volume NBS, black 384-wellplate (#4514, Corning). 0.1 μL of 100× test compound in 100% DMSO (atspecific solutions) were mixed with 2.4 μL of Kinase Buffer (50 mM HEPESpH 7.5, 0.01% BRIJ-35, 10 mM MgCl₂, 1 mM EGTA), 5 μL of 2× Kinase(1.22-10.3 ng CDK2/cyclin A)/Peptide (2 μM Ser/Thr 12), and 2.5 μL of4×ATP solution (31 μM). The plates were shaken for 30 seconds, andincubated for 60 minutes at room temperature. Development ReagentSolution (5 μL of 1:1024 dilution) was added to the plates followed withanother 30-second plate shake and the plates were further incubated atroom temperature for one hour. The plates were read on fluorescenceplate reader with Dual emission at 445 nm and 520 nm.

IC₅₀ values of compounds against CDKS (p25) were determined by Z′-LYTE™.These screening assays were performed at Invitrogen Life Technologies(Grand Island, N.Y.) on a low volume NBS, black 384-well plate (#4514,Corning). 0.1 μL of 100× test compound in 100% DMSO (at specificsolutions) were mixed with 2.4 μL of Kinase Buffer (50 mM HEPES pH 7.5,0.01% BRIJ-35, 10 mM MgCl₂, 1 mM EGTA), 5 μL of 2× Kinase (0.18-2 ngCDKS/p25)/Peptide (2 μM Ser/Thr 12), and 2.5 μL of 4×ATP solution (17μM). The plates were shaken for 30 seconds, and incubated for 60 minutesat room temperature. Development Reagent Solution (5 μL of 1:4096dilution) was added to the plates followed with another 30-second plateshake and the plates were further incubated at room temperature for onehour. The plates were read on fluorescence plate reader with Dualemission at 445 nm and 520 nm.

The following equations were used for Z′-LYTE™ Screening Assay DataAnalysis. Percent inhibition (100-% activity) was fitted to the“four-parameter logistic model” in XLfit for determination of IC₅₀values.

Equation Correction for Background Fluorescence FI_(Sample) −FI_(TCFI Ctl) Emission Ratio (using values corrected for backroundfluorescence)$\frac{{Coumarin}{Emission}\left( {445{nm}} \right)}{{Fluorescein}{Emission}\left( {520{nm}} \right)}$% Phosphorylation (% Phos)$\left\{ {1 - \frac{\left( {{Emission}{Ratio} \times F_{100\%}} \right) - C_{100\%}}{\left( {C_{0\%} - C_{100\%}} \right) + \left\lbrack {{Emission}{Ratio} \times \left( {F_{100\%} - F_{0\%}} \right)} \right\rbrack}} \right\}*100$% Inhibition$\left\{ {1 - \frac{\%{Phos}_{Sample}}{\%{Phos}_{0\%{Inhibition}{Ctl}}}} \right\}*100$Z' (using Emission Ratio values)$1 - \frac{{3*{Stdev}_{0\%{Phos}{Ctl}}} + {3*{Stdev}_{0\%{Inhibition}}}}{{Mean}_{0\%{Phos}{Ctl}} - {Mean}_{0\%{Inhinition}}}$Difference Between Data Points (single point only) |%Inhibition_(Point 1) − % Inhibition_(Point 2)| Development ReactionInterference (DRI) (no ATP control)$\frac{{Emission}{Ratio}_{{DRI}{Ctl}}}{{Emission}{Ratio}_{0\%{Phos}{Ctl}}}$Test Compound Fluorescence Interference (TCFI) (check both Coumarin andFluorescein emissions)$\frac{{FI}_{{TCFI}{Ctl}}}{{FI}_{0\%{Inhibition}{Ctl}}}$ FI =Fluorescence Intensity C_(100%) = Average Coumarin emission signal ofthe 100% Phos. Control C_(0%) = Average Coumarin emission signal of the0% Phos. Control F_(100%) = Average Fluorescein emission signal of the100% Phos. Control F_(0%) = Average Fluorescein emission signal of the0% Phos. Control DRI = Development Reaction Interference TCFI = TestCompound Fluorescence Interference

IC₅₀ values of compounds against CDK7 (cyclin H) were determined byAdapta™ Assay at Invitrogen Life Technologies (Grand Island, N.Y.) wheretotal reaction volume was 10 μL/well in low volume, white 384-well plate(#4512, Corning). 0.100 μL of 100× test compound in 100% DMSO (atspecific solutions) were mixed with 2.4 μL of HEPES (30 mM), 2.5 μL of4× ATP solution (153 μM) and 5 μL of 2× Substrate/Kinase mixture (the 2×CDK7/cyclin H/MNAT1/CDK7/9tide mixture was prepared in 50 mM HEPES pH7.5, 0.01% BRIJ-35, 10 mM MgCl₂, 1 mM EGTA). The final 10 μL KinaseReaction consisted of 5-38.75 ng CDK7/cyclin H/MNAT1 and 200 μMCDK7/9tide in 32.5 mM HEPES pH 7.5, 0.005% BRIJ-35, 5 mM MgC12, 0.5 mMEGTA. The plates were shaken for 30 seconds, centrifuged for 1 min at1000×g, and incubated for 60 minutes at room temperature. 5 μL ofDetection Mix (prepared in TR-FRET Dilution Buffer; the Detection mixconsists of EDTA (30 mM), Eu-anti-ADP antibody (6 nM) and ADP tracer,and contains the EC₆₀ concentration of tracer for 5-150 μM ATP) wasadded to the plates followed with another 30-second plate shake andcentrifugation for 1 min at 1000×g, and the plates were furtherincubated at room temperature for one hour. The plates were read onfluorescence plate reader with Dual emission at 615 nm and 665 nm.

The following equations were used for Adapta™ Assay Data Analysis. TheATP/ADP standard curve was fit to model number 205 (sigmoidaldose-response model) in XLfit. The dose response curve was also curvefit to model number 205.

Equation Emission Ratio$\frac{{AF}647{Emission}\left( {665{nm}} \right)}{{Europium}{Emission}\left( {615{nm}} \right)}$% Conversion$\left\{ \frac{{EC}_{50{SC}}}{\left( \frac{{Top}_{SC} - {Bottom}_{SC}}{{{Emission}{Ratio}_{Sample}} - {Bottom}_{SC}} \right) - {1\hat{}\left( \frac{1}{{Hillslope}_{SC}} \right)}} \right\}*100$% Inhibition$\left\{ {1 - \frac{\%{Conversion}_{Sample}}{\%{Conversion}_{0\%{Inhibition}{Ctrl}}}} \right\}*100$Difference Between |% Inhibition_(Point 1) − % Inhibition_(Point 2)|Data Points (single point only) Test Compound For each emissionwavelength, fluorescence interference is flagged for a compound wellthat Interference is more than 20% outside the range of the controls. Z'(using Emission Ratio values)$1 - \frac{{3*{Stdev}_{0\%{Conv}{Ctrl}}} + {3*{Stdev}_{0\%{Inhibition}}}}{❘{{Mean}_{0\%{Conv}{Ctrl}} - {Mean}_{0\%{Inhinition}}}❘}$ *SC = Standard Curve

IC₅₀ values of compounds against CDK2 (cyclin E1) were determined byLanthaScreen™ Eu Kinase Binding Assay at Invitrogen Life Technologies(Grand Island, N.Y.)) where total reaction volume was 16 μL/well in lowvolume, white 384-well plate (#784207, Greiner). 0.16 μL of 100× testcompound in 100% DMSO (at specific solutions) were mixed with 3.84 μL ofKinase Buffer (50 mM HEPES pH 7.5, 0.01% BRIJ-35, 10 mM MgCl₂, 1 mMEGTA), 8.0 μL of 2× Kinase (2.5 nM)/Antibody (Eu-anti-GST, 2 nM) Mixtureand 4.0 μL of 4× Tracer (Tracer 236, 100 nM). The plates were shaken for30 seconds, and incubated for 60 minutes at room temperature. The plateswere read on fluorescence plate reader with Dual emission at 615 nm and665 nm.

IC₅₀ values of compounds against CDK9 (cyclin K) were determined byLanthaScreen™ Eu Kinase Binding Assay at Invitrogen Life Technologies(Grand Island, N.Y.) where total reaction volume was 16 μL/well in lowvolume, white 384-well plate (#784207, Greiner). 0.16 μL of 100× testcompound in 100% DMSO (at specific solutions) were mixed with 3.84 μL ofKinase Buffer (50 mM HEPES pH 7.5, 0.01% BRIJ-35, 10 mM MgCl₂, 1 mMEGTA), 8.0 μL of 2× Kinase (5 nM)/Antibody (Eu-anti-His, 2 nM) Mixtureand 4.0 μL of 4×Tracer (Tracer 236, 100 nM). The plates were shaken for30 seconds, and incubated for 60 minutes at room temperature. The plateswere read on fluorescence plate reader with Dual emission at 615 nm and665 nm.

IC₅₀ values of compounds against FMS kinase were determined byLanthaScreen™ Eu Kinase Binding Assay at Invitrogen (Life TechnologiesGrand Island, N.Y.) where total reaction volume was 10 μL in low-volume384-well plates (#4511, Corning). Serially diluted compounds (3-fold)were incubated with kinase (1.25 nM) for 10 min, following which amixture of ATP (10 μM) (#A1852, Sigma, St-Louis, Mo.) andfluorescent-PolyGT substrate (200 nM) (#PV3610, Invitrogen, LifeTechnologies Grand Island, N.Y.) was added and incubated in dark at roomtemperature for 1 h. After 1 h, 10 μL stop solution containing Terbiumlabeled antibody (4 nM) (#PV3529, Invitrogen, Life Technologies GrandIsland, N.Y.) and EDTA (#E5134, Sigma, St-Louis, Mo.) (20 mM) in TR-FRETdilution buffer (# PV3574, Invitrogen, Life Technologies Grand Island,N.Y.) was added. Readings were taken in a Synergy Neo Plate reader(BioTek, Winooski) at single excitation of 340 nm and Dual emission at495 nm and 520 nm respectively.

The following equations were used for LanthaScreen Eu Kinase BindingAssay Data Analysis. Percent inhibition (100-% activity) was fitted tothe “four-parameter logistic model” in XLfit for determination of IC₅₀values.

Equation Emission Ratio (ER)$\frac{{AF}647{Emission}\left( {665{nm}} \right)}{{Europium}{Emission}\left( {615{nm}} \right)}$% Displaceinent$\left. \left\{ \frac{{ER}_{0\%{Disp}{Ctrl}} - {ER}_{Sample}}{{ER}_{0\%{Disp}{Ctrl}} - {ER}_{100\%{Disp}{Ctrl}}} \right. \right)*100$Difference Between |% Displacement_(Point 1) − % Displacement_(Point 2)|Data Points (single point only) Test Compound For each emissionwavelength, fluorescence interference is flagged for a compound wellInterference that is more than 20% outside the range of the controls. Z'(using Emission Ratio values)$1 - \frac{{3*{Stdev}_{0\%{Disp}{Ctlr}}} + {3*{Stdev}_{100\%{Disp}{Ctrl}}}}{❘{{Mean}_{0\%{Disp}{Ctrl}} - {Mean}_{100\%{Disp}{Ctrl}}}❘}$

IC₅₀ values of compounds against the PI3Kδ kinase were performed byReaction Biology Corporation. Briefly, this assay was conducted inbuffer (Tris-HC140 mM (pH7.5), Orthovanadate 3 mM, MgCl₂ 20 mM, DTT 2mM, CHAPS 0.05%, DMSO 1%). PI3Kδ kinase was added to the reactionsolution and mixed gently. The test compounds in 100% DMSO (at specificsolutions) were mixed with the kinase reaction mixture to achieve thefinal compounds at pre-defined concentrations (e.g, range −0.5 nM to 100μM) by Acoustic technology (Echo550; nanoliter range). After incubatingfor 10 min at room temp, ATP was added into the reaction mixture toinitiate the reaction followed by a 30-min incubation at 30° C. Afterquenching the reaction with ADP-Glo reagent, the plates were incubatedfor 40 min. The Detection Mixture was added, and the plate was incubatedfor an additional 30 min. At the end of incubation, luminescence wasmeasured. For data analysis, the luminescence was converted into μM ADPproduction based on ADP standard curves. The nonlinear regression toobtain the standard curve and IC₅₀ values were performed using GraphpadPrism software (La Jolla, Calif.).

IC₅₀ values of compounds disclosed herein against the kinases listedabove are given in Table 2 below.

Table 2

CDK4 CDK6 CDK1/B CDK2/A CDK2/E CDK5/p25 CDK7/H CDK9/K FMS PI3Kδ CompoundIC₅₀ IC₅₀ IC₅₀ IC₅₀ IC₅₀ IC₅₀ IC₅₀ IC₅₀ IC₅₀ IC₅₀ No. (nM) (nM) (nM)(nM) (nM) (nM) (nM) (nM) (nM) (nM) 1 0.2 0.2 ND ND ND ND ND ND 1330 33602 6 6.9 ND ND ND ND ND ND >5000 ND 3 3 5.7 ND ND ND ND ND ND >5000 ND 40.7 0.1 130  12 ND ND ND ND 566 >5000 5 ND ND ND ND ND ND ND ND >3630 ND6 ND ND ND ND ND ND ND ND 82 ND 8 ND ND ND ND ND ND ND ND >5000 ND9 >183 173 ND ND ND ND ND ND >5000 ND 10 4.5 2.5 ND ND ND ND ND ND 570ND 11 6 8 ND ND ND ND ND ND 250 ND 12 12 2   3.9   0.7 7.2 ND ND ND 29674 13 2 1.5 ND ND ND ND ND ND 2 ND 14 3.5 2 ND ND ND ND ND ND 49 ND 1537 30 ND ND ND ND ND ND 22 ND 16 1 1 ND ND ND ND ND ND 2.5 ND 17 8 3.5ND ND ND ND ND ND 21 ND 18 10 15 ND ND ND ND ND ND 19 ND 19 1 1 ND ND NDND ND ND 3 ND 20 95 187 ND ND ND ND ND ND 17 ND 21 6 8 ND ND ND ND ND ND163 ND 22 2 2 ND ND ND ND ND ND 6.5 ND 23 2 2 ND ND ND ND ND ND 25 488524 9 5   5.8   4.6 ND 3.5 96 4 14 >10000 25 6 4   6.7   3.4 ND 3.6 145 5 5 6100 26 10 134 ND ND ND ND ND ND 61 ND 27 1 5 ND ND ND ND ND ND 7.5ND 28 1 11 ND ND ND ND ND ND 123 ND 29 1 13 ND ND ND ND ND ND 2.5 ND 301 13 ND ND ND ND ND ND 79 ND 31 2.5 32 ND ND ND ND ND ND 49 ND 32 12 21ND ND ND ND ND ND 177 ND 33 1.5 1.5  3  2 ND 1   54 2 48 ND 34 3 6 ND NDND ND ND ND 42 ND 35 2.5 3 ND ND ND ND ND ND 58 ND 36 4 5 ND ND ND ND NDND 102 ND 37 6.5 3.5 ND ND ND ND ND ND 18 ND 38 1.5 2  3  2 ND 2   163 2 40 ND 39 4 7.5 ND ND ND ND ND ND 33 ND 47 3.5 4 ND ND ND ND ND ND 2.5ND 52 89 200 ND ND ND ND ND ND 14 ND 178 48 98 ND ND ND ND ND ND 5 ND206 56 100 ND ND ND ND ND ND 2.5 ND 436 1.5 2 82  8 ND 38   2360 73  >5000 ND 437 4 5  9  3 ND 7.7 85 4 3 ND 438 41 74 ND ND ND ND ND ND5 ND 439 7.5 20 ND ND ND ND ND ND 6 ND 440 2 2 ND ND ND ND ND ND 2434994 441 1 0.6 ND ND ND ND ND ND 526 >50000 442 2 1 73  7 ND 27   1160 41  353 >50000 443 3 3 ND ND ND ND ND ND 950 >50000 444 1.6 3.4 ND ND NDND ND ND 67 >50000 445 31 69 ND ND ND ND ND ND 69 >50000 446 3.9 8.8679  68 ND ND >10000   280  1115 21768 447 1.1 1.6 238  36 NDND >10000   243  1678 >50000 448 3.2 8.8 ND ND ND ND ND ND 8 8015 4491.1 0.9 ND ND ND ND ND ND 9.5 4485 450 0.5 0.3 ND ND ND ND ND ND214 >50000 451 28 27 ND ND ND ND ND ND 28 >50000 452 20 45 ND ND ND NDND ND 8 589 453 12 30 ND ND ND ND ND ND >5000 >50000 454 18 83 ND ND NDND ND ND >5000 >50000 455 4.5 3 ND ND ND ND ND ND 1.5 13136 456 4 3.5 <1<1 ND ND ND ND 4 19499 457 3.5 7.5 ND ND ND ND ND ND 68 ND 458 0.5 10 NDND ND ND ND ND 29 ND 460 13 18 ND ND ND ND ND ND >5000 ND 461 3.5 9 NDND ND ND ND ND 17 ND 462 5.5 9 ND ND ND ND ND ND 25 ND 463 1.5 3.5 ND NDND ND ND ND 17 ND 464 8.5 22 ND ND ND ND ND ND 42 ND 465 37 123 ND ND NDND ND ND 66 397 466 4 10 ND ND ND ND ND ND 35 1114 467 4 5 ND ND ND NDND ND 14 2427 468 8 8 ND ND ND ND ND ND 36 3785 469 >196 200 ND ND ND NDND ND 46 >30000 470 2 19 ND ND ND ND ND ND 142 3672 471 10 53 ND ND NDND ND ND 454 1994 472 2.5 5 ND ND ND ND ND ND ND 29072 473 54 105 ND NDND ND ND ND 7 3167 474 0.5 4.5 ND ND ND ND ND ND 776 1164 476 4 25 ND NDND ND ND ND 174 703 477 3.5 4.5 158  25 ND ND ND ND 752 >50000 478 9 27453  97 ND ND ND ND 2215 33705 479 2.5 5 213  44 ND ND ND ND 2597 ND 4805.5 14 ND ND ND ND ND ND 82 1159 481 1 4 69 24 ND ND ND ND 426 >20000482 3 16 155  29 ND ND ND ND 1751 >50000 483 25 20 181  44 ND ND NDND >5000 >50000 484 20 93 ND ND ND ND ND ND >5000 >50000 485 7.5 22 NDND ND ND ND ND 3248 >50000 486 16 41 ND ND ND ND ND ND >5000 >50000 48755 111.5 ND ND ND ND ND ND >5000 >50000 488 101 200 ND ND ND ND NDND >5000 >50000 489 90 159 ND ND ND ND ND ND >5000 >50000 490 2 9.5 NDND ND ND ND ND 2117 >50000 491 21 31 ND ND ND ND ND ND 4586 >50000 49514 39  5  2 ND ND ND ND ND ND 496 >161 >200 ND ND ND ND ND ND ND ND 4976 14 85 14 ND ND ND ND ND ND 498 1 3 223  155  ND ND ND ND ND ND 499 1526 69 19 ND ND ND ND ND ND 500 16 34 ND ND ND ND ND ND ND ND 501 2 5 NDND ND ND ND ND ND ND 502 12 28 69 74 ND ND ND ND ND ND 503 5 18 ND ND NDND ND ND ND ND 504 141 >200 ND ND ND ND ND ND ND ND 505 23 60 ND ND NDND ND ND ND ND 506 2 2 ND ND ND ND ND ND ND ND 507 6 13   1.3   3.2 NDND ND ND ND ND 509 5 10 78 33 ND ND ND ND ND ND 510 3 4 ND ND ND ND NDND ND ND 511 ND 16 ND ND ND ND ND ND ND ND 512 1 2  2 <1 ND ND ND ND NDND 513 2 8 <1  3 ND ND ND ND ND ND 515 145 >200 ND ND ND ND ND ND ND ND516 1 4 ND ND ND ND ND ND ND ND 517 1.5 4 ND ND ND ND ND ND ND ND 518 428 1187  560  ND ND ND ND ND ND 520 9 77 <1 <1 ND ND ND ND ND ND 521 5.519.8 ND ND ND ND ND ND ND ND 522 36 105 ND ND ND ND ND ND ND ND 523 2051 21 74 ND ND ND ND ND ND 524 3.5 7.5 ND ND ND ND ND ND ND ND 788 2 4ND ND ND ND ND ND ND ND 790 ND 3 ND ND ND ND ND ND ND ND 791 9 41 ND NDND ND ND ND ND ND 792 4 4 ND ND ND ND ND ND ND ND 843 65 24 ND ND ND NDND ND ND ND 844 31 35 ND ND ND ND ND ND ND ND 845 23 29 ND ND ND ND NDND ND ND 846 3 4 ND ND ND ND ND ND ND ND 847 44 107 ND ND ND ND ND ND NDND 848 44 110 ND ND ND ND ND ND ND ND ND: Not Determined

Example B2 Determination of Potency of Compounds in Cancer CellProliferation Assay as a Single Agent.

The effects of test compounds were studied in seven cell lines withvarious histotypes. The cancer cells (Table 3) were harvested during thelogarithmic growth period and counted. Adjust cell concentrations to theappropriated number with respective medium and add 90 μL cellsuspensions to 96-well plates. After cells were seeded, the plates wereshaken gently to distribute cells evenly and incubated at 37° C, 5% CO₂on day 1.

TABLE 3 Cell Culture Conditions Cell Histo- Rb No. Line pathology StatusMedium 1 A549 Lung Positive DMEM + adenocarcinoma 10% FBS 2 HCT-116Colorectal Positive McCoy's 5a + carcinoma 10% FBS 3 MCF-7 BreastPositive MEM + 10% adenocarcinoma FBS 4 ZR-75-30 Breast ductal PositiveRPMI-1640 + carcinoma 10% FBS 5 Hs-578T Breast epithelia PositiveRPMI-1640 + carcinoma 10% FBS 6 BT-549 Breast ductal Negative RPMI1640 +carcinoma 10% FBS 7 DU4475 Breast Negative RPMI1640 + carcinoma 10% FBS

Cells were treated with test compounds at 7 to 9 concentrations within adesired concentration range (e.g. 1.1 nM-10 μM) on day 2 by seriesdiluting the test compound stock solution (10 mM in DMSO) with culturemedium. Treatment duration was in the range of 24-168 hr, depending onthe cell type. Cell viability was assessed by Cell Titer-Glo® asrecommended by Promega (Cat. No.: G7572), or by Brdu ELISA assay orresazurin assay, as recommended by Sigma Aldrich (Cat. No.: 11647229001and R7017, respectively) post treatment.

Cell viability data were plotted using GraphPad Prism (version 5,GraphPad Software, Inc, San Diego, Calif.). In addition, a nonlinearregression model with a sigmoidal dose response and variable slopewithin GraphPad Prism was used to calculate the IC₅₀ value of individualtest compounds. IC₅₀ values are given in Table 4. Additional compounds,treated for 24-168 hours, are shown in Table 5.

TABLE 4 IC₅₀ (nM) A549 HCT116 MCF-7 ZR-75-30 Hs-578T BT-549 DU4475Treatment Duration (h) Compound No. 72 72 72 24 24 24 168 1 65 515 68 4960 3200 575 12 <13 <13 <10 ND ND 230 40 ND: Not Determined

TABLE 5 IC₅₀ (nM) Compound No. A549 MCF-7 BT-549 DU4475 4 ND 110 ND ND 6ND 30 ND ND 9 ND 3255 ND ND 10 ND 280 ND ND 11 ND 225 ND ND 13 ND 3.8 NDND 14 ND 11 ND ND 15 ND 114 ND ND 16 ND 3.8 ND ND 17 ND 15 ND ND 18 ND<10 ND ND 19 ND <10 ND ND 20 ND 145 ND ND 21 ND <10 ND ND 22 ND <10 NDND 23 ND <10 ND ND 24 ND <10  <370 10 25 ND 25 <1110 46 26 ND 163 ND ND27 ND 40 ND ND 28 ND 150 ND ND 29 ND 48 ND ND 30 ND 233 ND ND 31 ND 193ND ND 32 ND 130 ND ND 33 ND <14 ND 40 34 ND 50 ND ND 35 ND 20 ND ND 36ND 40 ND ND 37 ND <14 ND ND 38 ND 20 ND 45 39 ND 45 ND ND 47 ND 20 ND ND52 ND 695 ND ND 178 ND 210 ND ND 206 ND 670 ND ND 436 390 165 ND 383 437ND 45 ND ND 438 ND 200 ND ND 439 ND 90 ND ND 440 ND 30 ND ND 441 ND 95ND ND 442 465 125 ND 503 443 ND 285 ND ND 444 ND 1250 ND ND 445 ND 120ND ND 446 ND 850 ND 385 447 ND 300 ND 230 448 ND 50 ND ND 449 ND 50 NDND 450 ND 240 ND ND 451 ND 30 ND ND 452 ND 50 ND ND 453 ND 695 ND ND 454ND 920 ND ND 455 ND <4 ND ND 456 ND <4 ND ND 457 ND 55 ND 30 458 ND 30ND 35 460 ND 595 ND ND 461 ND 30 ND 50 462 ND 40 ND 65 463 ND 20 ND 25464 ND 85 ND 80 465 ND 80 ND ND 466 ND 105 ND ND 467 ND 185 ND ND 468 ND95 ND ND 469 ND 495 ND ND 470 ND 100 ND 75 471 ND 45 ND 110 472 ND 30 ND570 473 ND 30 ND 55 474 ND 300 ND 940 476 ND 65 ND 135 477 ND 280 ND1100 478 ND 665 ND 1685 479 ND 240 ND ND 480 ND 190 ND 435 481 ND 85 ND345 482 ND 230 ND 540 483 ND 460 ND 665 484 ND 1345 ND 2485 485 ND 470ND 555 486 ND 325 ND 1450 487 ND 615 ND 2170 488 ND 830 ND 2565 489 ND1820 ND 4505 490 ND 80 ND 420 491 ND 465 ND 450 495 ND 110 ND 310 496 ND1450 ND 3420 497 ND 40 ND 95 498 ND 170 ND 465 499 ND 175 ND 345 500 ND625 ND 2495 501 ND 140 ND 1015 502 ND 435 ND 405 503 ND 240 ND 1260 504ND 1940 ND 4150 505 ND 1037 ND 3440 506 ND 354 ND 1495 507 ND <5 ND 20509 ND 1086 ND 1475 510 ND 293 ND 1970 511 ND 648 ND 3790 512 ND 6 ND465 513 ND 17 ND 50 515 ND 2501 ND >10000 516 ND 155 ND 995 517 ND 108ND 275 518 ND 1020 ND 1330 520 ND 13 ND <7 521 ND 3670 ND 7705 522 ND345 ND 395 523 ND 55 ND 75 524 ND 332 ND ND 788 ND 130 ND 920 790 ND 17ND 20 791 ND 90 ND 205 792 ND 32 ND 75 ND: Not Determined

Effects of compound 24 on cell proliferation in additional cell lines(Table 6) were studied. Cells were harvested during the logarithmicgrowth period and counted. The cell concentrations were adjusted to theappropriate concentrations with their respective media, and 90 μl cellsuspensions were added to 96-well plates. When cells were added, theplate was shaken gently to distribute cells evenly. The cells wereincubated at 37° C, 5% CO2. The next day, cells were treated with thetest compound. 3× serial dilutions of compound stock solutions wereprepared with respective solvents. The stock solution was diluted withculture medium to make 10× working solutions. 10 μl (10×) drug solutionwas dispensed in each well (triplicates for each concentration). Theplate was incubated for 72 hrs in a humidified incubator at 37° C. with5% CO2. For plate reading, CTG solution was thawed and equilibrated toroom temperature. 50 ul of CTG was added per well, the contents weremixed for 2 min on the plate shaker, and a 10 min incubation was donebefore recording the luminescence signal using an Envision plate reader(PerkinElmer).

TABLE 6 Inhibition of cancer cell proliferation by compound 24. MOLM-13OCI-AML3 SU-DHL-4 U2932 NCI-H929 RPMI-8226 Seeding Density (cells/well)6000 8000 10000 8000 10000 6000 Compound 24 IC₅₀ (nM) 20 36 42 29 44 65

Additional test compounds will be studied in the same and/or othercancer cell lines using similar proliferation methods with possiblevariables, such as cell seeding densities and/or incubation durations.The cell cycle phase distribution post treatment of test compounds willbe studied using flow cytometer using DAPI staining. Cellular senescencewill be evaluated after continuously treating cells for a long time(e.g, 14 days) followed by staining cells lines for Senescenceassociated-β-galactosidase (SAβGAL).

Example B3 Determination of pRb Levels

Hypo-phosphorylation of the retinoblastoma protein (pRb) by cyclinD:Cdk4/6 complexes results in active pRb, which is a clinically relevantbiomarker associated with CDK4 or CDK6 inhibition. As a confirmatorymeasure of functional activity of CDK4/6, the Ser780 phosphorylationstate of RB1 was assessed. MCF-7 cells were plated at 2.5×10⁵ to 3.0×10⁶cells/well in 6-well cell-culture plates and incubated at 37° C. for 24h in MEM medium supplemented with 10% FBS. Cells were treated for 24 hwith a medium containing test compound at various concentrations (e.g,0.01, 0.1, 1 μM) or with DMSO (<1%) in duplicate. After incubationperiod, the media was removed, and cells were rinsed once with ice-coldPBS and lysed with 0.2 mL of Cell Lysis Buffer containing 1 mM PMSF andProtease Inhibitor. Protein concentration was estimated followingBradford method. The lysis and the pRB measurements were performedfollowing the manufacturer's ELISA kit protocols and buffers (CellSignaling Technology, Cat. No.: 13016C). pRb inhibition of testcompounds were calculated as percentage of vehicle control. Values aregiven in Table 7.

TABLE 7 pRb Inhibition % Compound No. 1 μM 0.1 μM 0.01 μM 1 89 80 77 1281 81 −5

The effects of selected test compounds in additional cancer cell lineson clinically relevant biomarkers associated with CDK4 or CDK6inhibition (e.g, pRB and thymidine kinase (TK)) is assessed using ELISAor Western Blotting methods with selective antibodies.

Example B4 Determination of Potency and Combination Effects of Compoundsin Cancer Cell Proliferation Assays Using Combination Therapy.

Effects of test compounds on cell proliferation is studied in additionalcancer cell lines, such as estrogen receptor over-expressing cancercells, in the combination of another anti-cancer therapy (e.g, anaromatase inhibitor and/or a selective estrogen receptor degrader forbreast cancer) using CTG, resazurin and/or Brdu assays. Cells seeded ina 96-well plate are treated with single agents to obtain a dose responsecurve for each agent. Cells are also treated with combinations of thedrugs, based on a matrix generated by combining the two drugs at alldifferent combinations of the doses used in the dose response curves. Inplace of a combination matrix method, a fixed drug ratio dilution methodin which drugs are combined in a fixed ratio of 5 or more dilutions mayalso be used. The combined treatment effect, such as additive,synergistic, or antagonistic, is determined using the median-effectprinciple (Chou TC. Cancer Res 2010;70:440-6.), with the combinationindex (CI) value indicating an additive effect (CI=1), synergism (CI<1),or antagonism (CI>1) in drug combinations.

Example B5 In Vivo Pharmacology Studies in Xenograft or Syngeneic Models

The anti-tumor activity of test compounds is studied against varioushuman tumor xenograft or syngeneic models in mice for example, in breastcancer tumor models. For breast cancer tumor models, effects of testcompounds on Rb-Positive or Rb-Negative tumors as a single agent or incombination with another anti-cancer therapy is determined by evaluatingthe difference of tumor volume between treatment group against thevehicle control group. The phosphorylation status of serine-780 on Rb isevaluated in tumor tissue and compared with antitumor response inRb-Positive xenograft model(s). Additional pharmacodynamic end points(e.g, FoxM1, E2F1, c-Myc, and cyclin D1) are studied in tumor tissuescollected at various time points post treatment. Induction of senescenceis evaluated in tumor samples from various treatment groups by measuringSAβGAL.

Example B6 In Vivo Pharmacology Study in MC-38 Mouse Model

The therapeutic efficacy of compound 24 in the treatment of the MC-38murine colorectal cancer model was evaluated in combination with an antimPD-1 antibody. Cultured MC-38 cells were harvested and re-suspended inbase medium at a density of 1×10⁷ cells/mL with viability greater than90%. Female C57BL/6 mice were inoculated subcutaneously at the rightflank with 1×10⁶ cells in 0.1 mL base medium for tumor development. Thetreatments were started on day 5 after tumor inoculation when the tumorsize reached 45-72 mm³ (average tumor size 56 mm³). The test article wasadministered to the mice according to the predetermined regimen as shownin the experimental design table (Table 8). Formulations were preparedas in Table 9 below.

TABLE 8 Groups and Treatments for Efficacy Study Dosing Dose VolumeDosing Group n Treatment (mg/kg) (mL/kg) Route Schedule 1 10 Vehiclecontrol* — 10 PO QD × 21 days 2 10 anti mPD-1 10 10 IP BIW × 2 weeks 3 5anti mPD-1 + 10 + 10 10 + 10 IP + PO BIW × 2 weeks + compound 24 BIW × 2weeks 4 5 compound 24 10 10 PO BIW × 2 weeks Vehicle was 0.5% HPMCMethocel K100 LV + 0.1% Polysorbate 80 (pH adjusted to 3.8 with citricacid for both compounds)

TABLE 9 Formulation Preparation Compounds Package Preparation Conc.mg/mL Storage Vehicle — 1. Added 199.8 mL of water into a glass — 4° C.bottle. 2. Added 1 g of HPMC Methocel K100 LV into the glass bottle andstirred it. 3. Added 0.2 mL of Polysorbate 80 into the glass bottle andmixed thoroughly until a homogenous solution was obtained. 4. AdjustedPH to 3.8 with citric acid, kept the solution at 4° C. compound 24 30.43mg/vial 1. Weighed 8.85 mg of compound 24 in 1 4° C. clear, borosilicateglass vial; 2. Solubilized compound 24 in 8 mL of Vehicle solution;vortexed vigorously; 3. Adjusted PH to 3.8 with citric acid, kept thesuspension at 4° C. and use within 7 days Anti mPD-1 6.27 mg/mL 1. Added6.27 mL PBS into a 10 mL tube. 1 4° C. 2. Added 1.19 mL stock solutioninto the tube and mixed thoroughly. Note: Ensured that formulation washomogenous immediately before use by sonication and vigorous vortex.

Body Weight Change

All treatments groups were well-tolerated. Mean (±SEM) body weightchange and relative change (%) in female C57BL/6 mice bearing MC-38tumors are shown in FIG. 1 and FIG. 2 . In FIG. 1 , data pointsrepresent group mean body weight. Error bars represent standard error ofthe mean (SEM). In FIG. 2 , data points represent percent group meanchange in body weight. Error bars represent standard error of the mean(SEM).

Tumor Measurements and Endpoints

Tumor sizes were measured three times a week in two dimensions using acaliper, and the volume was expressed in mm³ using the formula: V=0.5a×b² where a and b are the long and short diameters of the tumor,respectively. The tumor sizes were then used for the calculations ofboth tumor growth inhibition (TGI) and T/C values.

TGI is calculated for each group using the formula listed below:

TGI(%)=[1-(TV_(Treatment_DayN)-TV_(Treatment_Day0))/(TV_(Vehicle_DayN)-TV_(Vehicle_Day0))]×100%

TV_(Treatment_DayN) is the average tumor volume of a treatment group ona given day, TV_(Treatment_Day0) is the average tumor volume of thetreatment group on the first day of treatment, TV_(Vehicle_DayN) is theaverage tumor volume of the vehicle control group on a given day, andTV_(Vehicle_Day0) is the average tumor volume of the vehicle group onthe first day of treatment.The T/C value (in percent) is an indication of antitumor effectivenessand calculated as below:

T/C (%)=RT_(VTreatment)/RTV_(control)×100%

(RTV_(Treatment): the mean RTV of the treatment group; RTV_(control) themean RTV of the vehicle treated group).

RTV (relative tumor volume)=TV_(DayN)/TV_(Day0).

-   TV_(DayN) and TV_(Day0) is the tumor volume on day N and Day 0    respectively. T/C (%)≤42% is considered as significant antitumor    activity and <10% is considered as highly significant antitumor    activity by the National Cancer Institute criteria.-   Mean±SEM of tumor volume over time in female C57BL/6 mice bearing    MC-38 tumors dosed with vehicle, anti-mPD-1, compound 24 and    anti-mPD-1+compound 24 is shown in Table 10. Calculated tumor growth    inhibition is shown in Table 11.

TABLE 10 Tumor Volume over Time Tumor volume (mm³)^(a) Anti- mPD-1 Anti-10 mg/kg mPD-1 compound 24 compound 24 Days Vehicle 10 mg/kg 10 mg/kg 10mg/kg 0 57 ± 3 56 ± 3 56 ± 4 58 ± 4 2 94 ± 8  89 ± 12 88 ± 5  89 ± 13 5213 ± 30 164 ± 20 127 ± 20 165 ± 20 7 400 ± 56 228 ± 35 152 ± 37 280 ±47 9  754 ± 128 343 ± 70 164 ± 86 462 ± 62 12 1342 ± 187  659 ± 177  246± 126  929 ± 197 14  453 ± 208 1493 ± 267 16  597 ± 278 1892 ± 353 191094 ± 434 Note: ^(a)Mean ± SEM; For Group 1 and 2 n = 10, for group 3and 4 n = 5

TABLE 11 Mean ± SEM Tumor Growth Inhibition Calculation Based on TVMeasurements at Day 12 Tumor Size (mm³)^(a) Treatment at day 12 RTV atday 12 T/C (%) TGI (%) p value^(b) p value^(c) Vehicle 1342 ± 187  23.62± 3.31 — — — Anti-mPD-1 659 ± 177 11.99 ± 3.44 50.76 53.06 <0.001 (10mg/kg) Anti-mPD-1 246 ± 126  4.74 ± 2.71 20.07 85.16 <0.001 <0.001 (10cmg/kg) + compound 24 10 mg/kg compound 24 929 ± 197 15.59 ± 2.41 66.0032.19 <0.01 10 mg/kg Note: ^(a)Mean ± SEM. ^(b)All groups compared togroup 1 ^(c)Combination group compared to group 2Tumor growth curves are shown in FIG. 3A and FIG. 3B. Data pointsrepresent group mean, error bars represent standard error of the mean(SEM). Individual tumor growth curves are shown in FIGS. 4A-4D. Tumorgrowth inhibition curves are shown in FIG. 5 .

Survival Curves

The time-to-end point Kaplan-Meier survival curves were plotted usingGraphpad and presented in FIG. 6 . Endpoint is defined as tumor volumereaching 2000 mm³.

Although the foregoing invention has been described in some detail byway of illustration and example for purposes of clarity ofunderstanding, it is apparent to those skilled in the art that certainminor changes and modifications will be practiced in light of the aboveteaching. Therefore, the description and examples should not beconstrued as limiting the scope of the invention.

What is claimed is:
 1. A compound of Formula (J):

or a salt thereof, wherein: Z is

wherein A is C₃-C₆ cycloalkyl, 4- to 7-membered heterocyclyl, 5- to 7-membered heteroaryl, or C₆ aryl, each of which is optionally substituted with R⁵; L is a bond, —CR¹¹R¹²—, —O—, —S—, —SO₂—, —C(O)—, —NR¹⁰—, —SO₂NR¹⁰—, or —NR¹⁰SO₂—; B is hydrogen, C₃-C₆ cycloalkyl, 3- to 7-membered heterocyclyl, 5- to 7-membered heteroaryl, or C₆ aryl, each of which is optionally substituted with R⁶; C is C₃-C₆ cycloalkyl, 5- to 7-membered heterocyclyl, 5- to 7-membered heteroaryl, or C₆ aryl, each of which is optionally substituted with R⁵, wherein C is fused to D; and D is C₃-C₆ cycloalkyl, 3- to 7-membered heterocyclyl, 5- to 7-membered heteroaryl, or C₆ aryl, each of which is optionally substituted with R⁶; each X and Y are independently N or CH, provided that at least one of X and Y is N; R¹ is hydrogen, C₁-C₆ alkyl, C₂-C₆ alkenyl, C₂-C₆ alkynyl, C₁-C₈ alkoxy, C₃-C₆ cycloalkyl, 3- to 12-membered heterocyclyl, 5- to 10-membered heteroaryl, C₆-C₁₄ aryl, —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), —(C₁-C₃ alkylene)(3- to 12-membered heterocyclyl), —C(O)R¹⁰-(C₃ alkylene)(5- to 10-membered heteroaryl) or —(C₁-C₃ alkylene)(C₆-C₁₄ aryl), wherein R¹ is independently optionally substituted by halogen, oxo, —OR¹³, —NR¹³R¹⁴, —C(O)R¹³, —CN, C₃-C₈ cycloalkyl, or C₁-C₆ alkyl optionally substituted by oxo, —OH or halogen, provided that when Z is

n is 1 and R² is oxo, then R¹ is C₂-C₆ alkyl, C₂-C₆ alkenyl, C₂-C₆ alkynyl, C₁-C₈ alkoxy, C₃-C₆ cycloalkyl, 3- to 12-membered heterocyclyl, 5- to 10-membered heteroaryl, C₆-C₁₄ aryl, —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), —C(O)R¹⁰, or —(C₁-C₃ alkylene)(C₆-C₁₄ aryl), wherein Ri is independently optionally substituted by halogen, oxo, —OR¹³, —C(O)R¹³, —CN, C₃-C₈ cycloalkyl, or C₁-C₆ alkyl optionally substituted by oxo, —OH or halogen; each R² is independently C₁-C₆ alkyl, oxo, —NR¹¹R¹², —CN, —C(O)R¹⁰, —C(O)NR¹¹R¹² or halogen, wherein any two R² groups are independently attached to same carbon or two different carbons; each of R³ and R⁴ is independently C₁-C₆ alkyl, C₃-C₆ cycloalkyl, C₁-C₆ haloalkyl, C₁-C₆ alkoxy, C₁-C₆haloalkoxy, halogen or —OH; each R⁵ is independently C₁-C₆ alkyl, C₂-C₆ alkenyl, C₂-C₆ alkynyl, halogen, oxo, —CN, —OR¹⁰, —SR¹⁰, —NR¹¹R¹², —C(O)R¹⁰, —C(O)NR¹¹R¹², —OC(O)NR¹¹R¹², —NR¹⁰C(O)R¹¹, —NR¹⁰C(O)NR¹¹R¹², —S(O)R¹⁰, —S(O)₂R¹⁰, —NR¹⁰S(O)₂R¹¹, —S(O)₂NR¹¹R¹², C₃-C₆ cycloalkyl, 3- to 12-membered heterocyclyl, —(C₁-C₃ alkylene)OR¹⁰, —(C₁-C₃ alkylene)SR¹⁰, —(C₁-C₃ alkylene)NR¹¹R¹², —(C₁-C₃ alkylene)C(O)R¹⁰, —(C₁-C₃ alkylene)C(O)NR¹¹R¹², —(C₁-C₃ alkylene)NR¹⁰C(O)R¹¹, —(C₁-C₃ alkylene)NR¹⁰C(O)NR¹¹R¹², —(C₁-C₃ alkylene)S(O)₂R¹⁰, —(C₁-C₃ alkylene)NR¹⁰S(O)₂R¹¹, —(C₁-C₃ alkylene)NR¹⁰S(O)₂NR¹¹R¹², —(C₁-C₃ alkylene)S(O)₂NR¹¹R¹², —(C1-C₃ alkylene)(C₃-C₆ cycloalkyl), —(C₁-C₃ alkylene)(3- to 12-membered heterocyclyl), wherein each R⁵ is independently optionally substituted by halogen, oxo, —OR¹³, —NR¹³R¹⁴, —C(O)R¹³, —CN, —(C₁-C₃ alkylene)OR¹³, —(C₁-C₃ alkylene)NR¹³R¹⁴, —(C₁-C₃ alkylene)C(O)R¹³, C₃-C₈ cycloalkyl, or C₁-C₆ alkyl optionally substituted by oxo, —OH or halogen; each R⁶ is independently oxo or R⁷, or any two R⁶ groups, when bound to the same carbon atom, are taken together with the carbon to which they are attached to form a C₃-C₆ cycloalkyl; R⁷ is independently hydrogen, C₁-C₆ alkyl, C₂-C₆ alkenyl, C₂-C₆ alkynyl, C₃-C₆ cycloalkyl, 3- to 6-membered heterocyclyl, —OR¹⁰, —NR¹¹R¹², —NR¹⁰C(O)R¹¹, —NR¹⁰C(O)NR¹¹R¹², —S(O)₂R¹⁰, —NR¹⁰S(O)₂R¹¹, —S(O)₂NR¹¹R¹², —C(O)R¹⁰, —C(O)NR¹¹R¹², (C₁-C₃ alkylene)CN, —(C₁-C₃ alkylene)OR¹⁰, —(C₁-C₃ alkylene)SR¹⁰, —(C₁-C₃ alkylene)NR¹¹R¹², —(C₁-C₃ alkylene)CF₃, —(C₁-C₃ alkylene)C(O)R¹⁰, —(C₁-C₃ alkylene)C(O)NR¹¹R¹², —(C₁-C₃ alkylene)NR¹⁰C(O)R¹¹, —(C₁-C₃ alkylene)NR¹⁰C(O)NR¹¹R¹², —(C₁-C₃ alkylene)S(O)₂R¹⁰, —(C₁-C₃ alkylene)NR¹⁰S(O)₂R¹¹, —(C₁-C₃ alkylene)S(O)₂NR¹¹R¹², —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), or —(C₁-C₃ alkylene)(3- to 6-membered heterocyclyl), wherein each R⁷ is independently optionally substituted by halogen, oxo, —OR¹³, —NR¹³R¹⁴, —C(O)R¹³, —CN, —(C₁-C₃ alkylene)OR¹³, —(C₁-C₃ alkylene)NR¹³R¹⁴, —(C₁-C₃ alkylene)C(O)R¹³, C₃-C₈ cycloalkyl, or C₁-C₆ alkyl optionally substituted by oxo, —OH or halogen; R¹⁰ is independently hydrogen, C₁-C₆ alkyl, C₃-C₆ cycloalkyl, —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), C₆-C₁₄ aryl, 5- to 6-membered heteroaryl or 3- to 6-membered heterocyclyl, each of which is independently optionally substituted by halogen, oxo, —CN, —OR¹⁵, —NR¹⁵R¹⁶, or C₁-C₆ alkyl optionally substituted by halogen, —OH or oxo; R¹¹ and R¹² are each independently hydrogen, C₁-C₆ alkyl, C₃-C₆ cycloalkyl, —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), C₆-C₁₄ aryl, 5- to 6-membered heteroaryl or 3- to 6-membered heterocyclyl, each of which is independently optionally substituted by halogen, oxo, —CN, OR¹⁵, —NR¹⁵R¹⁶ or C₁-C₆ alkyl optionally substituted by halogen, —OH or oxo; or R¹¹ and R¹² are taken together with the atom to which they attached to form a 3- to 6-membered heterocyclyl optionally substituted by halogen, oxo, or C₁-C₆ alkyl optionally substituted by halogen; R¹³ and R¹⁴ are each independently hydrogen or C₁-C₆ alkyl, wherein the C₁-C₆ alkyl of R¹³ and R¹⁴ are optionally substituted by halogen, —OR¹⁵, —NR¹⁵R¹⁶, or oxo; or R¹³ and R¹⁴ are taken together with the atom to which they attached to form a 3- to 6-membered heterocyclyl optionally substituted by halogen, oxo or C₁-C₆ alkyl optionally substituted by halogen or oxo; and R¹⁵ and R¹⁶ are each independently hydrogen, C₁-C₆ alkyl optionally substituted by halogen or oxo, C₂-C₆ alkenyl optionally substituted by halogen or oxo, or C₂-C₆ alkynyl optionally substituted by halogen or oxo; or R¹⁵ and R¹⁶ are taken together with the atom to which they attached to form a 3- to 6-membered heterocyclyl optionally substituted by halogen, oxo or C₁-C₆ alkyl optionally substituted by oxo or halogen; 1, m, p and q are each independently 0, 1,2 or 3, provided that at least one of m and 1 is not 0; n is 0, 1, 2, 3 or
 4. 2. The compound of claim 1, or a salt thereof, wherein the compound is of Formula (I):


3. The compound of claim 1, or a salt thereof, wherein the compound is of Formula (I-A):


4. The compound of claim 1, or a salt thereof, wherein the compound is of any one of Formula (I-B1) to (I-B12):


5. The compound of claim 1, or a salt thereof, wherein L is a bond, —CH₂—, —NH—, —O—, —S—, —SO₂—, —CO—, —NCH₃—, —SO₂NH—, or —HSO₂—.
 6. The compound of claim 1, or a salt thereof, wherein L is a bond.
 7. The compound of claim 1, or a salt thereof, wherein L is —O—.
 8. The compound of claim 1, or a salt thereof, wherein L is —NH—.
 9. The compound of claim 1, or a salt thereof, wherein L is —S—.
 10. The compound of claim 1, or a salt thereof, wherein L is —CH₂—.
 11. The compound of claim 1, or a salt thereof, wherein L is —SO₂—.
 12. The compound of claim 1, or a salt thereof, wherein L is —CO—.
 13. The compound of claim 1, or a salt thereof, wherein L is —NCH₃—.
 14. The compound of claim 1, or a salt thereof, wherein L is —SO₂NH—.
 15. The compound of claim 1, or a salt thereof, wherein L is —NHSO₂—.
 16. The compound of claim 1, or a salt thereof, wherein A is phenyl, pyridine, pyrimidine, pyrazolyl, thiazolyl, oxazolyl, isooxazolyl, imidazolyl, piperidinyl, pyrrolidinyl, azetidinyl, pyridone, cyclohexyl, or cyclopentyl, each of which is optionally substituted with R⁵.
 17. The compound of claim 1, or a salt thereof, wherein B is hydrogen, diazepanyl, azepanyl, piperazinyl, piperidinyl, pyrrolidinyl, azetidinyl, imidazolyl, pyrazolyl, phenyl, cyclopentyl, cyclohexyl, cyclohepy or cycloheptanyl, each of which is optionally substituted with R⁶.
 18. The compound of claim 1, or a salt thereof, wherein the compound is of any one of Formula (I-C1) to (I-C23):

wherein t and t′ are each independently 0, 1,2, or
 3. 19. The compound of claim 18, or a salt thereof, wherein t is 0 or
 1. 20. The compound of claim 1, or a salt thereof, wherein t′ is 0 or
 1. 21. The compound of claim 1, or a salt thereof, wherein the compound is of Formula (II):


22. The compound of claim 1, or a salt thereof, wherein C is fused with D to form a 7-12 membered bicyclic ring having at least one aromatic ring, wherein C and D are optionally substituted with R⁵ and R⁶.
 23. The compound of claim 1, or a salt thereof, wherein C is fused with D to form a 7-12 membered bicyclic ring having at least one aromatic ring and at least one nitrogen atom, wherein C and D are optionally substituted with R⁵ and R⁶.
 24. The compound of claim 1, or a salt thereof, wherein C is fused with D to form a ring selected from the group consisting of:


25. The compound of claim 1, or a salt thereof, wherein p is 0 or
 1. 26. The compound of claim 1, or a salt thereof, wherein each R⁵ is independently C₁-C₆ alkyl, halogen, oxo, —CN, —OR¹⁰, —NR¹¹R¹², —C(O)R¹⁰, —C(O)NR¹¹R¹², C₃-C₆ cycloalkyl, 3- to 12-membered heterocyclyl, —(C₁-C₃ alkylene)OR¹⁰, —(C₁-C₃ alkylene)NR¹¹R¹², —(C₁-C₃ alkylene)C(O)R¹⁰, —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), or —(C₁-C₃ alkylene)(3- to 12-membered heterocyclyl), each of which is optionally substituted by halogen, oxo, —OR¹³, —NR¹³R¹⁴, —C(O)R¹³, —CN, —(C₁-C₃ alkylene)OR¹³, —(C₁-C₃ alkylene)NR¹³R¹⁴, —(C₁-C₃ alkylene)C(OR¹³, C₃-C₈ cycloalkyl, or C₁-C₆ alkyl optionally substituted by oxo, —OH or halogen.
 27. The compound of claim 1, or a salt thereof, wherein each R⁵ is independently —CN, halogen, methoxy, oxo, trifluoromethoxy, —NH(CH₃), —N(CH₃)₂, —(CH₂)NH(CH₃), —(CH₂)NH₂, —(CH₂)N(CH₃)₂, —C(O)NH₂, —C(O)N(CH₃)₂, methyl, ethyl, isopropyl, n-propyl, cyclopropyl, —CH₂OH, —CH₂OCH₃, —NH(CH₂)₂N(CH₂CH₃)₂, —O(CH₂)₂N(CH₂CH₃)₂, trifluoromethyl,


28. The compound of claim 1, or a salt thereof, wherein q is 0 or
 1. 29. The compound of claim 1, or a salt thereof, wherein each R⁶ is independently C₁-C₆ alkyl, halogen, oxo, —CN, —NR¹¹R¹², —C(O)R¹⁰, C₃-C₆ cycloalkyl, 3- to 12-membered heterocyclyl, —(C₁-C₃ alkylene)OR¹⁰, —(C₁-C₃ alkylene)NR¹¹R¹², each of which is optionally substituted by halogen, oxo, —OR¹³, —NR¹³R¹⁴, —C(O)R¹³, —CN, —(C₁-C₃ alkylene)OR¹³, —(C₁-C₃ alkylene)NR¹³R¹⁴, —(C₁-C₃ alkylene)C(O)R¹³, C₃-C₈ cycloalkyl, or C₁-C₆ alkyl optionally substituted by oxo, —OH or halogen; or two R⁶ groups when bound to the same carbon atom, are taken together with the carbon to which they are attached to form a C₃-C₆ cycloalkyl.
 30. The compound of claim 1, or a salt thereof, wherein each R⁶ is independently ethyl, methyl, isopropyl, pyrrolidinyl, cyclopropyl, methoxy, —N(CH₃)₂, —NHCH₃, —CH₂OH, oxo, —C(O)CH₂NHCH₃, —CH₂CH₂OH, difluoroethyl, —CH₂N(CH₃)₂, —CH₂NH₂, —OH, —C(O)CH₂OH, —C(O)CH₂N(CH₃)₂, —C(O)N(CH₃)₂, —C(O)NHCH₃, —C(O)NH₂, —NHC(O)CH₃, —C(O)CH₃, —S(O)₂CH₃,


31. The compound of claim 1, or a salt thereof, wherein R⁷ is hydrogen, C₁-C₆ alkyl, C₃-C₆ cycloalkyl, or —C(O)R¹⁰, each of which is optionally substituted by halogen, oxo, —OR¹³, —NR¹³R¹⁴, —C(O)R¹³, —CN, —(C₁-C₃ alkylene)OR¹³, —(C₁-C₃ alkylene)NR¹³R¹⁴, —(C₁-C₃ alkylene)C(O)R¹³, C₃-C₈ cycloalkyl, or C₁-C₆ alkyl optionally substituted by oxo, —OH or halogen.
 32. The compound of claim 1, or a salt thereof, wherein R⁷ is hydrogen, methyl, ethyl, isopropyl, cycloproyl, —C(O)CH₂NHCH₃, or —CH₂CH₂OH.
 33. The compound of claim 1, or a salt thereof, wherein Xis N and Y is N.
 34. The compound of claim 1, or a salt thereof, wherein X is N and Y is CH; or X is CH and Y is N.
 35. The compound of claim 1, or a salt thereof, wherein R¹is hydrogen, C₁-C₆ alkyl, C₃-C₆ cycloalkyl, 3- to 12-membered heterocyclyl, 5- to 10-membered heteroaryl, C₆-C₁₄ aryl, —C(O)R¹⁰, —(C₁-C₃ alkylene)(C₃-C₆ cycloalkyl), —(C₁-C₃ alkylene)(3- to 12-membered heterocyclyl), —(C₁-C₃ alkylene)(5- to 10-membered heteroaryl) or —(C₁-C₃ alkylene)(C₆-C₁₄ aryl), each of which is optionally substituted with halogen, oxo, —NH₂.
 36. The compound of claim 1, or a salt thereof, wherein R¹ is selected from the group consisting of:


37. The compound of claim 1, or a salt thereof, wherein R¹ is methyl, ethyl, n-propyl, isopropyl, cyclopropyl, cyclopentyl, cyclohexyl, or cyclopropyl-methyl.
 38. The compound of claim 1, or a salt thereof, wherein R¹ is isopropyl.
 39. The compound of claim 1, or a salt thereof, wherein n is 0, 1,2, or
 3. 40. The compound of claim 1, or a salt thereof, wherein each R² is independently C₁-C₆ alkyl, oxo, —NR¹¹R¹², —CN, or halogen.
 41. The compound of claim 1, or a salt thereof, wherein each R² is independently methyl, oxo, or fluoro.
 42. The compound of claim 1, or a salt thereof, wherein m is 0 or
 1. 43. The compound of claim 1, or a salt thereof, wherein each R³ is independently C₁-C₆ alkyl, C₃-C₆ cycloalkyl, C₁-C₆haloalkyl, C₁-C₆ alkoxy, C₁-C₆haloalkoxy, or halogen.
 44. The compound of claim 1, or a salt thereof, wherein each R³ is independently fluoro, chloro, methyl, trifluoromethyl, trifluoromethoxy, methoxy, or cyclopropyl.
 45. The compound of claim 1, or a salt thereof, wherein each R⁴is independently C₁-C₆alkyl, C₃-C₆ cycloalkyl, C₁-C₆haloalkyl, C₁-C₆ alkoxy, C₁-C₆haloalkoxy, or halogen.
 46. The compound of claim 1, or a salt thereof, wherein each R⁴is independently fluoro, chloro, methyl, trifluoromethyl, trifluoromethoxy, methoxy, or cyclopropyl.
 47. The compound of claim 1, or a salt thereof, wherein l is 0 or
 1. 48. A compound or a salt thereof, wherein the compound is selected from the group consisting of compounds of Table
 1. 49. The compound of claim 48, or a pharmaceutically acceptable salt thereof.
 50. A pharmaceutical composition comprising the compound of claim 1, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
 51. A method of treating a cancer in an individual in need thereof comprising administering to the individual a therapeutically effective amount of a compound of claim 1, or a pharmaceutically acceptable salt thereof.
 52. The method of claim 51, where the cancer is a breast cancer, brain cancer, colorectal cancer, lung cancer, gastric cancer, liver cancer, leukemia, lymphoma, mantle cell lymphoma, melanoma, ovarian cancer, pancreatic cancer, prostate cancer, adult hematopoietic or solid tumor, or pediatric tumor.
 53. The method of claim 51, further comprising administering a radiation therapy to the individual.
 54. The method of claim 51, further comprising administering to the individual a therapeutically effective amount of a second therapeutic agent.
 55. The method of claim 54, wherein the second therapeutic agent is a cancer immunotherapy agent, an endocrine therapy agent, or a chemotherapeutic agent.
 56. The method of claim 54, wherein the second therapeutic agent is a cancer immunotherapy.
 57. The method of claim 54, wherein the second therapeutic agent is an anti-PD-1 antibody.
 58. The method of claim 55, wherein the endocrine therapy agent is an antiestrogen therapy, a selective estrogen receptor degrader (SERD), or an aromatase inhibitor.
 59. The method of claim 55, wherein the chemotherapeutic agent is a DNA alkylating agent, a platinum-based chemotherapeutic agent, a taxane, a BTK inhibitor, a PI3K inhibitor, another kinase inhibitor, or a DNA damage repair (DDR) pathway inhibitor.
 60. The method of claim 51, wherein the cancer comprises a mutated or overexpressed CDK gene.
 61. The method of claim 51, comprising selecting the individual for treatment based on (i) the presence of one or more mutations or amplifications of the CDK4 or CDK6 or other CDK gene in the cancer, (ii) overexpression of CDK4 or CDK6 or other CDK protein in the cancer, (iii) amplification or overexpression of the genes encoding cyclins, (iv) loss of endogenous INK4 inhibitors by gene deletion, mutation, or promoter hypermethylation, (v) other genetic events leading to overactivity of CDK4 or CDK6 or other CDK, or (vi) phosphorylation of retinoblastoma (Rb) protein in the cancer.
 62. A method of arresting the G₁-S checkpoint in a cell, comprising administering a compound of claim 1, or a salt thereof, to the cell.
 63. A method of inducing senescence in a cell, comprising administering a compound of claim 1, or a salt thereof, to the cell.
 64. A method of inducing apoptosis in a cell, comprising administering a compound of claim 1, or a salt thereof, to the cell.
 65. A method of inhibiting CDK4 or CDK6 in a cell, comprising administering a compound of claim 1, or a salt thereof, to the cell.
 66. A method of inhibiting CDK4 or CDK6, comprising contacting CDK4 or CDK6 with a compound of claim 1, or a salt thereof.
 67. The method of claim 66, wherein the inhibitor binds to CDK4 or CDK6 with an IC₅₀ of less than 1 μM according to a kinase assay.
 68. Use of a compound of claim 1, or a salt thereof, in the manufacture of a medicament for treatment of cancer.
 69. A kit comprising a compound of claim 1, or a salt thereof. 